Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cau tren » cu tren, dau tren, ca tren
te sach » toc sach
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
danh vi » hanh vi, dinh vi, danh di
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
luc va » tuc va, loc va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y nang xa hoi. hieu van cam ((luc va) OR (duc va)) danh vi ((cau tren) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang xa hoi. hieu van cam ((luc va) OR (duc va)) danh vi ((cau tren) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang xa hoi. hieu van cam ((luc va) OR (duc va)) danh vi ((cau tren) or (cua tre))".
• Adding a wildcard symbol may retrieve word variants: te sach y nang xa hoi. hieu van cam ((luc va) OR (duc va)) danh vi ((cau tren) or (cua tre))*.