Perhaps you should try some spelling variations:
nghien huu » nghien cuu, nguyen huu, nhiem huu
nganh nang » nganh nong, ganh nang, ngan hang
cau thanh » cuu thanh, cac thanh, cau thang
thanh van » thanh san, thanh toan, thanh phan
sach hoc » cach hoc, mach hoc, sach duoc
sach hoi » sach doi, sach moi, cach thoi
ha nganh » da nganh, va nganh, hoc nganh
hoi cau » hoi chu, hoc cau, hoa cau
son ha » son hai, son la
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 ha nganh nang luc xa hoi cau thanh van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach hoc) OR (sach hoi)) tap, nghien huu son ha nganh nang luc xa hoi cau thanh van.
• Adding a wildcard symbol may retrieve word variants: tu ((sach hoc) or (sach hoi)) tap, nghien huu son ha nganh nang luc xa hoi cau thanh van*.