Perhaps you should try some spelling variations:
phan hung » phan chung, phan ung, phan hong
toc sach » hoc sach, doc sach, thuoc sach
sach hoc » cach hoc, sach hoi, mach hoc
hoc phan » hoc dan, hoc pho
nhan tai » hang tai, van tai, toan tai
duoc xa » duoc va, duoc ha, uoc xa
duoc ma » duoc lam
va nhan » van nhan, ca nhan, va phan
cuu co » huu co, cua co, cuu mo

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 hoc tap, nghien cuu co hoc phan hung ((duoc xa) or (duoc ma)) hoi va nhan tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach hoc tap, nghien cuu co hoc phan hung ((duoc xa) OR (duoc ma)) hoi va nhan tai.
• Adding a wildcard symbol may retrieve word variants: toc sach hoc tap, nghien cuu co hoc phan hung ((duoc xa) or (duoc ma)) hoi va nhan tai*.