Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
lang van » dang van, tang van, hoang van
tu sach » su sach, te sach, tu cach
vai cua » dai cua, hai cua, lai cua
tuc van » thuc van, truc van, tuc va
cam tuc » cam xuc, cam tu, nam thuc
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay
va cam » va cham, va cac, va cao
cua cu » cua chu, cua cau, cua su

You may be able to get more results by adjusting your search query.

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