Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
hieu van » hieu va, thien van, lieu va
danh dau » lanh dao, hang dau, danh tu
van cham » van chat, van tham, va cham
cham luc » cham soc, nhan luc, cham cuu
va danh » va dinh, va dan, va hanh
ky tang » ky nang, ky dang, kho tang
te sach » toc sach
ma hoi » mai hoi, xa hoi, ma hoa
y tang » 6 tang, 7 tang, 5 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) OR (ky tang)) ma hoi. hieu van cham luc va danh dau ((cua triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y tang) OR (ky tang)) ma hoi. hieu van cham luc va danh dau ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y tang) OR (ky tang)) ma hoi. hieu van cham luc va danh dau ((cua triet) or (va triet))".
• Adding a wildcard symbol may retrieve word variants: te sach ((y tang) OR (ky tang)) ma hoi. hieu van cham luc va danh dau ((cua triet) or (va triet))*.