Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh sua » hinh su, hanh va, hanh tu
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
y nang » ky nang, ly nang, v nang
loc va » hoc va
luc va » duc va, tuc va
sua va » suat va, vua va, xua va
thiet » thieu

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 van cam ((loc va) or (luc va)) hanh sua va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. hieu van cam ((loc va) OR (luc va)) hanh sua va thiet.
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. hieu van cam ((loc va) or (luc va)) hanh sua va thiet*.