Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh dai » hanh tai, hanh dao, vanh dai
tu sach » thu sach, su sach, te sach
sach lo » sach dao, sach doi, sach hoi
lo vang » lo van, ly vang, hoa vang
vang xa » lang xa, mang xa, ang xa
hieu va » hieu qua
xuc van » duc van, luc van, vuc van
cua tre » cuu tre, cua triet, dua tren
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 lo vang xa hoi. ((hieu va) OR (lieu va)) cam xuc van hanh dai ((cua tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach lo vang xa hoi. ((hieu va) or (lieu va)) cam xuc van hanh dai ((cua tre) OR (cua te))~".
• Adding a wildcard symbol may retrieve word variants: tu sach lo vang xa hoi. ((hieu va) or (lieu va)) cam xuc van hanh dai ((cua tre) OR (cua te))*.