Perhaps you should try some spelling variations:
nghien huu » nghien cuu, nguyen huu, nhiem huu
nganh cong » nhanh chong, thanh cong
cong thuoc » cong thuc, dong thuoc, long thuoc
hoc nganh » hoc nhanh
huu tuan » huu han, huu tung
tuan hoc » toan hoc, luan hoc, than hoc
thuoc xa » thuoc ma, thuoc va, thuoc la
dan nhan » danh nhan, dan chan, van nhan
hop tap » hoc tap, hop tai, hop tan
hoi dan » hoa dan, hoc dan, hoi dap
nhan va » nhan tai, nhan dan, nhan tao

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ((hop tap) or (hop tac)), nghien huu tuan hoc nganh cong thuoc xa hoi dan nhan va~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ((hop tap) OR (hop tac)), nghien huu tuan hoc nganh cong thuoc xa hoi dan nhan va.
• Adding a wildcard symbol may retrieve word variants: tu cac ((hop tap) or (hop tac)), nghien huu tuan hoc nganh cong thuoc xa hoi dan nhan va*.