Perhaps you should try some spelling variations:
thien van » thi van
toc sach » hoc sach, doc sach, thuoc sach
cau tren » cu tren, dau tren, ca tren
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
cuu tre » cua tre, cau treo
y nang » ky nang, ly nang, v nang
cam tu » cam thu, nam tu, dam tu
ca dan » cac dan, ca dao
dan vi » doan vi, don vi, dan va
tu ca » tu cac, tu cua, tu can

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y nang xa hoi. thien van cam tu ca dan vi ((cuu tre) OR (cau tren))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang xa hoi. thien van cam tu ca dan vi ((cuu tre) OR (cau tren))".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang xa hoi. thien van cam tu ca dan vi ((cuu tre) OR (cau tren))*.