Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
va nang » van nang, da nang, cam nang
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
xuc van » luc van, vuc van, xuc ban
duc van » duc va, duc tan, duc manh
vu nang » vuc nang, vu dang, v nang
hanh ki » hanh vi, hanh ky, hanh kien
te sach » toc sach
va cam » va cham, va cac, va cao
ki su » ky su

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 ((vu nang) or (va nang)) mai hoi. hieu va cam ((xuc van) OR (duc van)) hanh ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((vu nang) OR (va nang)) mai hoi. hieu va cam ((xuc van) OR (duc van)) hanh ki su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((vu nang) or (va nang)) mai hoi. hieu va cam ((xuc van) OR (duc van)) hanh ki su triet".
• Adding a wildcard symbol may retrieve word variants: te sach ((vu nang) or (va nang)) mai hoi. hieu va cam ((xuc van) OR (duc van)) hanh ki su triet*.