Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
sach thi » sach thu, sach tai, sach thieu
thanh ca » thanh cha, thanh cac, thanh ha
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
hanh lai » hanh lam, hanh tai, thanh lap
cua viet » ca viet, hoa viet, cua vat
cac tuc » cac toc, cac tu, cac tac
xa hanh » xa thanh, xa khanh, va hanh
lai cua » dai cua, hai cua, lai chau
ca hoi » cau hoi, cua hoi, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach thi thanh ca hoi. ((hieu qua) or (lieu va)) ((cac tuc) or (cac nuoc)) xa hanh lai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach thi thanh ca hoi. ((hieu qua) OR (lieu va)) ((cac tuc) OR (cac nuoc)) xa hanh lai cua viet.
• Adding a wildcard symbol may retrieve word variants: toc sach thi thanh ca hoi. ((hieu qua) or (lieu va)) ((cac tuc) or (cac nuoc)) xa hanh lai cua viet*.