Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cam » vien cac, vien cao, vien nam
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
truc va » thuc va, thuc vat, trung va
vai cua » hai cua, lai cua, bai cua
y nang » ky nang, ly nang, v nang
tuc va » thuc va, tuc xa, duc 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 y nang xa hoi. hieu vien cam ((tuc va) OR (truc va)) hanh ((vai cua) or (dai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. hieu vien cam ((tuc va) OR (truc va)) hanh ((vai cua) OR (dai cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang xa hoi. hieu vien cam ((tuc va) OR (truc va)) hanh ((vai cua) or (dai cua)) triet".
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. hieu vien cam ((tuc va) OR (truc va)) hanh ((vai cua) or (dai cua)) triet*.