Perhaps you should try some spelling variations:
sach trien » sach tien, sach tren, sach thieu
trien nang » trien nong, trien mang, thien nang
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
thanh vi » hanh vi, thanh va, thanh ve
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
xuc va » tuc va, luc va, xac va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach trien nang xa hoi. hieu van cam ((xuc va) or (duc va)) thanh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach trien nang xa hoi. hieu van cam ((xuc va) OR (duc va)) thanh vi ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: thu sach trien nang xa hoi. hieu van cam ((xuc va) or (duc va)) thanh vi ((cua tre) or (cuu tre))*.