Perhaps you should try some spelling variations:
nghien huu » nghien cuu, nguyen huu, nhiem huu
nhan khong » nhan thong, nhanh chong, nganh khong
khong hoc » khung hoc, thong hoc, khong thuoc
dan thanh » dang thanh, danh thanh, van thanh
ban thanh » ban hanh, ban hang
hoc nhan » hoc nhanh, nhoc nhan, hoc phan
anh hoc » sinh hoc, benh hoc, hinh hoc
huu mot » cuu mot, huy mot, hieu mot
mot hoc » mon hoc, mo hoc, mot goc
hoc mai » hoc ma, hoc dai, hoc bai
mai hoi » mai khoi, dai hoi, lai hoi
tu anh » tu hanh, tu manh, thu anh

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu anh hoc tap, nghien huu mot hoc nhan khong hoc mai hoi ((dan thanh) or (ban thanh)) phan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu anh hoc tap, nghien huu mot hoc nhan khong hoc mai hoi ((dan thanh) OR (ban thanh)) phan.
• Adding a wildcard symbol may retrieve word variants: tu anh hoc tap, nghien huu mot hoc nhan khong hoc mai hoi ((dan thanh) or (ban thanh)) phan*.