Perhaps you should try some spelling variations:
va tuyen » va truyen, tac tuyen, ke tuyen
sach kem » hanh kem
va trien » va truyen, va thiet, va tieng
hieu van » hieu va, thien van, lieu va
va hanh » van hanh, va thanh, va danh
cam tuc » cam xuc, cam tu, nam thuc
lang xa » lang ha, dang xay, lang van
van cam » van nam, van lam, van cau
tuc va » thuc va, truc va, tuc xa

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 kem) or (sach y)) lang xa hoi. hieu van cam tuc va hanh vi ((va trien) OR (va tuyen))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach kem) OR (sach y)) lang xa hoi. hieu van cam tuc va hanh vi ((va trien) OR (va tuyen)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach kem) or (sach y)) lang xa hoi. hieu van cam tuc va hanh vi ((va trien) OR (va tuyen))".
• Adding a wildcard symbol may retrieve word variants: te ((sach kem) or (sach y)) lang xa hoi. hieu van cam tuc va hanh vi ((va trien) OR (va tuyen))*.