Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cao » vien cac, vien dai, vien da
vu nang » vuc nang, va nang, vu dang
cao xuc » cam xuc, cao duc, cao suc
va hanh » van hanh, va thanh, va danh
vai cua » hai cua, lai cua, bai cua
su sach » so sach, vu sach
v nang » va nang, van nang, voi nang
xuc va » duc va, tuc va, luc 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 ((v nang) OR (vu nang)) xa hoi. hieu vien cao xuc va hanh ((vai cua) or (dai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((v nang) OR (vu nang)) xa hoi. hieu vien cao xuc va hanh ((vai cua) OR (dai cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((v nang) OR (vu nang)) xa hoi. hieu vien cao xuc va hanh ((vai cua) or (dai cua)) triet".
• Adding a wildcard symbol may retrieve word variants: su sach ((v nang) OR (vu nang)) xa hoi. hieu vien cao xuc va hanh ((vai cua) or (dai cua)) triet*.