Perhaps you should try some spelling variations:
nghien huu » nghien cuu, nguyen huu, nhiem huu
doanh nang » doanh sang, doanh nhung, doanh quang
hoa doanh » toan doanh, hoa dan
sach hoc » cach hoc, mach hoc, sach duoc
sach hoi » sach doi, sach moi, cach thoi
cac phan » cac nhan, cao phan, cap phan
phan van » pham van, thanh van, luan van
son hoa » so hoa, mon hoa, son ha
hoi cac » hoc cac, voi cac, hoa cac
luc xa » tuc xa, buc xa, luc va

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 hoc) or (sach hoi)) tap, nghien huu son hoa doanh nang luc xa hoi cac phan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach hoc) OR (sach hoi)) tap, nghien huu son hoa doanh nang luc xa hoi cac phan van.
• Adding a wildcard symbol may retrieve word variants: tu ((sach hoc) or (sach hoi)) tap, nghien huu son hoa doanh nang luc xa hoi cac phan van*.