Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu hang » thi hang, thuc hanh, thu huong
qua chat » qua nhat, qua cham, luan chat
dieu tra » dieu tri, kiem tra
te sach » toc sach
hang xa » hoang xa, hang va, hang ca
van anh » van thanh, tuan anh, van minh

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach thu hang xa hoi. hieu qua chat va van anh ((dieu tra) OR (dieu cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thu hang xa hoi. hieu qua chat va van anh ((dieu tra) OR (dieu cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach thu hang xa hoi. hieu qua chat va van anh ((dieu tra) OR (dieu cua)) tre*.