Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thanh nhan » thanh phan, thanh san, thanh toan
sach hoc » cach hoc, sach hoi, mach hoc
cuu tong » cuu cong, cuu tinh, huu tung
tong hoc » tuong hoc, thong hoc, trong hoc
hoc hang » hoc hanh, hoc bang, hoc tang
va hoc » van hoc
hoc xa » hoc ma

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach hoc tap, nghien cuu tong hoc hang va hoc xa hoi ((thanh nhan) or (benh nhan)) tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach hoc tap, nghien cuu tong hoc hang va hoc xa hoi ((thanh nhan) OR (benh nhan)) tai.
• Adding a wildcard symbol may retrieve word variants: thuat sach hoc tap, nghien cuu tong hoc hang va hoc xa hoi ((thanh nhan) or (benh nhan)) tai*.