Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
dan hai » doan hai, dang hai, dan khai
cua tre » cuu tre, cua triet, dua tren
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, xach tay
cac tuc » cac toc, cac tu, cac tac
ve cac » va cac, vien cac
va dan » ca dan, va dao, va dau
tuc va » thuc va, truc va, tuc xa
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ty) or (sach thu)) nang xa hoi. hieu ve cac tuc va dan hai ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach thu)) nang xa hoi. hieu ve cac tuc va dan hai ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach thu)) nang xa hoi. hieu ve cac tuc va dan hai ((cua tre) or (cua te))*.