Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
dau tren » dau tien, dat tren, dau tieng
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
truc va » thuc va, thuc vat, trung va
xuc va » duc va, tuc va, luc va
vi dau » vi dai, va dau, bi dau

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 ky nang xa hoi. hieu van cam ((xuc va) or (truc va)) hanh vi dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang xa hoi. hieu van cam ((xuc va) OR (truc va)) hanh vi dau tren.
• Adding a wildcard symbol may retrieve word variants: te sach ky nang xa hoi. hieu van cam ((xuc va) or (truc va)) hanh vi dau tren*.