Perhaps you should try some spelling variations:
"thu hoach truc nghiep chan hoc" » "thu hoach trac nghiem chan hoc", "thu hoach thuc nghiem chan hoc", "thu hoach tac nghiep chan hoc", "thu hoach truc nghiep thanh hoc", "thu hoach truc nghiep luan hoc", "thu hoach truc nghiep cua hoc", "thu hoc truc nghiep chan hoc", "thu hoach thu nghiep chan hoc", "thu sach truc nghiep chan hoc", "thu hoach truc nghiep chat hoc", "thu hoach truc nghiep nhan hoc", "thu hoach truc nghiep than hoc"
"thu bach van nghe dan hoc" » "thi bach van nghe dan hoc", "thu sach van nghe dan hoc", "truc bach van nghe dan hoc", "thu bach dan nghe dan hoc", "thu cach van nghe dan hoc", "thu bach dang nghe dan hoc", "thu bach van nghe van hoc", "thu bach van nghe dan toc", "thu bach van nghe dai hoc"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("thu hoach truc nghiep chan hoc") or ("thu bach van nghe dan hoc"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("thu hoach truc nghiep chan hoc") OR ("thu bach van nghe dan hoc")).
• Removing quotes may allow a broader search: (( thu hoach truc nghiep chan hoc ) or ( thu bach van nghe dan hoc )).
• Adding a wildcard symbol may retrieve word variants: (("thu hoach truc nghiep chan hoc") or ("thu bach van nghe dan hoc"))*.