Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
cac thuc » cach thuc, cac thu, cay thuc
hanh vai » hanh vi, hanh va, hanh tai
lang van » dang van, tang van, hoang van
can thuc » dan thuc, van thuc, cay thuc
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
van hoi » van hoa, van hoc, van hoe
va lang » va nang, hoa lang
so sanh » do sanh
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: ((hoc sach) or (so sanh)) va lang van hoi. hieu qua ((cac thuc) or (can thuc)) va hanh vai cua tuc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (so sanh)) va lang van hoi. hieu qua ((cac thuc) OR (can thuc)) va hanh vai cua tuc.
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) or (so sanh)) va lang van hoi. hieu qua ((cac thuc) or (can thuc)) va hanh vai cua tuc*.