Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
trung va » truong va, trang va, trung ha
thanh va » thanh van, hanh va, thanh ha
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
tuc va » thuc va, truc va, tuc xa
va cua » va chua, via cua, ca cua

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