Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ve triet » va trien, su triet
danh dau » lanh dao, hang dau, danh tu
cham luc » cham soc, nhan luc, cham cuu
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
va danh » va dinh, va dan, va hanh
mai hoi » mai khoi, dai hoi, lai hoi
te sach » toc sach
y tang » ky tang, 6 tang, 7 tang
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y tang ((mai hoi) or (xa hoi)). hieu ve cham luc va danh dau ((cua triet) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y tang ((mai hoi) OR (xa hoi)). hieu ve cham luc va danh dau ((cua triet) OR (ve triet)).
• Adding a wildcard symbol may retrieve word variants: te sach y tang ((mai hoi) or (xa hoi)). hieu ve cham luc va danh dau ((cua triet) or (ve triet))*.