Perhaps you should try some spelling variations:
ve triet » va trien, su triet
hieu van » hieu va, thien van, lieu va
hanh vai » hanh va, hanh tai, hanh van
cam luc » cam xuc, cau luc
sach ky » sac ky, sach y, sach ty
su sach » so sach, vu sach
hieu ve » hieu va
nang ma » tang ma, sang ma, nang cao
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: su sach ky nang ma hoa. ((hieu ve) or (hieu van)) cam luc va ((hanh vai) or (hanh vi)) ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ma hoa. ((hieu ve) OR (hieu van)) cam luc va ((hanh vai) OR (hanh vi)) ve triet.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ma hoa. ((hieu ve) or (hieu van)) cam luc va ((hanh vai) or (hanh vi)) ve triet*.