Perhaps you should try some spelling variations:
phan thuong » hang thuong, phan xuong
thuong hoc » truong hoc, tuong hoc, thuong ho
sach hoc » sach hoi, mach hoc, sach duoc
cach hoc » cach thuc, cach thoi, dich hoc
cuu dong » cuu cong, cuu tong, cuu long
dong luc » nang luc
luc phan » duc phan, luc nhan, luan phan
dai khoi » dai hoi, dai khoa, mai khoi
nhan dan » phan dau, gian dan, nhan tai
hoc dai » hoc dan
khoi va » hoi va, khi va, choi va
va nhan » van nhan, ca nhan, va phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach hoc) or (cach hoc)) tap, nghien cuu dong luc phan thuong hoc dai khoi va nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach hoc) OR (cach hoc)) tap, nghien cuu dong luc phan thuong hoc dai khoi va nhan dan.
• Adding a wildcard symbol may retrieve word variants: te ((sach hoc) or (cach hoc)) tap, nghien cuu dong luc phan thuong hoc dai khoi va nhan dan*.