Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van lam » van nam
su tren » su tien, tu tren, cu tren
xuc va » tuc va, luc va, xac va
vi su » va su, ve su, ki su

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