Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
dinh vai » dinh van, dinh vi, dinh va
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty hang » ly hang, ty xang, thi hang
hang xa » hoang xa, hang va, hang ca
cam tuc » cam xuc, cam tu, nam thuc
va dinh » van dinh, va kinh, va tinh
vai cua » dai cua, hai cua, lai cua
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 ty hang xa hoi. ((hieu qua) or (hieu quan)) cam tuc va dinh vai cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty hang xa hoi. ((hieu qua) OR (hieu quan)) cam tuc va dinh vai cua vat.
• Adding a wildcard symbol may retrieve word variants: te sach ty hang xa hoi. ((hieu qua) or (hieu quan)) cam tuc va dinh vai cua vat*.