Perhaps you should try some spelling variations:
thien van » thi van
toc sach » hoc sach, doc sach, thuoc sach
cam thue » cam thu, lam thue, nam thue
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
thue va » thuc va, thuyet va, thuc vat
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang
dan vi » doan vi, don vi, gan vi
dan va » doan va, dan ca, ban va

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang xa hoi. thien van cam thue va ((dan vi) OR (dan va)) cuu tre~".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang xa hoi. thien van cam thue va ((dan vi) OR (dan va)) cuu tre*.