Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tang tai » hang tai, dung tai, sang tao
hanh dai » hanh tai, hanh dao, vanh dai
hoc sach » hoc sinh, hoc cac, hoc anh
tang mai » tang ma, lang mai, sang mai
hieu ve » hieu va, hieu van
luc va » duc va, tuc va
loc va » hoc va
ve cau » ke cau, va cau, ve cac

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 y ((tang mai) or (tang tai)) hoi. hieu ve cau ((luc va) or (loc va)) hanh dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach y ((tang mai) OR (tang tai)) hoi. hieu ve cau ((luc va) OR (loc va)) hanh dai cua triet.
• Adding a wildcard symbol may retrieve word variants: hoc sach y ((tang mai) or (tang tai)) hoi. hieu ve cau ((luc va) or (loc va)) hanh dai cua triet*.