Perhaps you should try some spelling variations:
sach thueu » sach thieu, sach thue
cua viet » ca viet, hoa viet, cua vat
thuc van » thuc vat, thuc dan, thuc hanh
sach thu » sach thue, sach thieu, sach tham
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
hang xa » hoang xa, hang va, hang ca
va lam » van lam, va lap
vi cua » vai cua, di cua

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 thu) or (sach thueu)) hang xa hoi. hieu va lam ((thuc van) or (thuc va)) hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thu) OR (sach thueu)) hang xa hoi. hieu va lam ((thuc van) OR (thuc va)) hanh vi cua viet.
• Adding a wildcard symbol may retrieve word variants: tu ((sach thu) or (sach thueu)) hang xa hoi. hieu va lam ((thuc van) or (thuc va)) hanh vi cua viet*.