Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
van hanh » van thanh, ban hanh, van anh
hanh ki » hanh vi, hanh ky, hanh kien
xuc van » duc van, luc van, vuc van
va cham » va chat, va tham
sach vu » sach tu, sach uu, sach xu
nang ma » tang ma, sang ma, nang cao
sach va » sach xa, sach ha, sach dao
ma hoi » mai hoi, xa hoi, ma hoa
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: tu ((sach vu) or (sach va)) nang ma hoi. hieu ((va cham) or (va cac)) xuc van hanh ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach vu) OR (sach va)) nang ma hoi. hieu ((va cham) OR (va cac)) xuc van hanh ki su triet.
• Adding a wildcard symbol may retrieve word variants: tu ((sach vu) or (sach va)) nang ma hoi. hieu ((va cham) or (va cac)) xuc van hanh ki su triet*.