Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
qua pham » quan pham, quy pham, qua cham
ban hanh » ban hang
hanh tai » thanh tai, hang tai, han tai
sach ty » sach y, sach tu, xach tay
dang xa » dang xay, lang xa, dang ha
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, cua triet
cua tuc » cua duc, cua tu, cua thuoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu ((sach ty) or (sach thu)) dang xa hoi. hieu qua pham duc ban hanh tai ((cua tre) or (cua tuc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach ty) OR (sach thu)) dang xa hoi. hieu qua pham duc ban hanh tai ((cua tre) OR (cua tuc)).
• Adding a wildcard symbol may retrieve word variants: vu ((sach ty) or (sach thu)) dang xa hoi. hieu qua pham duc ban hanh tai ((cua tre) or (cua tuc))*.