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
la tren » loai tren, dua tren, dat tren
cua tre » cua te, cuu tre, cua triet
van lam » van nam
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
loc va » hoc va
luc va » duc va, tuc 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 ky lang xa hoi. hieu van lam ((luc va) OR (loc va)) hanh vi ((la tren) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky lang xa hoi. hieu van lam ((luc va) OR (loc va)) hanh vi ((la tren) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky lang xa hoi. hieu van lam ((luc va) OR (loc va)) hanh vi ((la tren) or (cua tre))".
• Adding a wildcard symbol may retrieve word variants: te sach ky lang xa hoi. hieu van lam ((luc va) OR (loc va)) hanh vi ((la tren) or (cua tre))*.