Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
doc sach » hoc sach, toc sach, nuoc sach
hanh lai » hanh lam, hanh tai, thanh lap
van hanh » van thanh, ban hanh, van anh
cham tuc » nham thuc, tham thuc, cham soc
lang van » dang van, tang van, hoang van
van hoi » van hoa, van hoc, van hoe
lai cua » dai cua, hai cua, lai chau
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach _ lang van hoi. ((hieu qua) or (lieu va)) ((cham tuc) or (pham thuc)) van hanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach _ lang van hoi. ((hieu qua) OR (lieu va)) ((cham tuc) OR (pham thuc)) van hanh lai cua tre.
• Adding a wildcard symbol may retrieve word variants: doc sach _ lang van hoi. ((hieu qua) or (lieu va)) ((cham tuc) or (pham thuc)) van hanh lai cua tre*.