Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
ty mang » ty hang, tin mang, tri mang
hieu va » hieu qua
cam tuc » cam xuc, cam tu, nam thuc
va hanh » van hanh, va thanh, va danh
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di cua
cua te » cua tu

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 ((ty mang) OR (ty xang)) xa hoi. ((hieu va) OR (lieu va)) cam tuc va hanh vi cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty mang) or (ty xang)) xa hoi. ((hieu va) OR (lieu va)) cam tuc va hanh vi cua te~".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty mang) or (ty xang)) xa hoi. ((hieu va) OR (lieu va)) cam tuc va hanh vi cua te*.