Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
cham tuc » nham thuc, pham thuc, tham thuc
mai khoi » mai khoa, tai khoa, cac khoi
danh dau » lanh dao, hang dau, danh tu
va danh » va dinh, va dan, va hanh
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu vu » hieu va, hieu ve, hieu su
mai hoi » dai hoi, lai hoi, mai doi
vu cham » va cham, vu kham, tu cham
tuc va » thuc va, truc va, tuc xa

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 ky nang ((mai hoi) or (mai khoi)). hieu vu cham tuc va danh dau ((cua triet) OR (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((mai hoi) OR (mai khoi)). hieu vu cham tuc va danh dau ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ((mai hoi) or (mai khoi)). hieu vu cham tuc va danh dau ((cua triet) OR (va triet))".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((mai hoi) or (mai khoi)). hieu vu cham tuc va danh dau ((cua triet) OR (va triet))*.