Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
te sach » toc sach
cong xa » cong xay, cong xua, cong ha
hieu va » lieu va, hieu qua
cau luc » cau truc, cau phuc
va hanh » van hanh, va thanh, va danh
va cau » van cau, va cac, va dau
luc va » duc va, tuc va, loc va
vi cua » vai cua
di cua » dai cua, doi cua, de cua

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: ((te sach) OR (thu sach)) tai cong xa hoi. hieu va cau luc va hanh ((vi cua) OR (di cua)) te~.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thu sach)) tai cong xa hoi. hieu va cau luc va hanh ((vi cua) or (di cua)) te*.