Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
cac xuc » cam xuc, cac nuoc, chat xuc
va hanh » va thanh, va danh, ban hanh
vai cua » hai cua, lai cua, bai cua
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang

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