Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
sach thu » sach thue, sach thieu, sach tham
thu hang » thi hang, thuc hanh, thu huong
cham xuc » cam xuc, chat xuc, cham soc
doan van » hoang van, luan van, tran van
tu sach » thu sach, su sach, te sach
hang xa » hoang xa, hang va, hang ca
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
xuc van » duc van, luc van, vuc van
cua tre » cua te, cuu tre, dua tren

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach thu hang xa hoi. hieu vu cham xuc van ((doan van) or (doan va)) ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu hang xa hoi. hieu vu cham xuc van ((doan van) OR (doan va)) ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach thu hang xa hoi. hieu vu cham xuc van ((doan van) or (doan va)) ((cua tre) or (cua triet))*.