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 toan » huu tuan, cuu toan, huy toan
toan hoc » toan khoa, van hoc, hoa hoc
thuoc xa » thuoc ma, thuoc va, thuoc la
van nhan » van phan, van thanh, danh nhan
hop tap » hoc tap, hop tac, hop tan
hop tai » hop tac, hoc tai, hoi tai
hoi van » hoi va, hoi dan, hai van
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 tai)), nghien huu toan hoc nganh cong thuoc xa hoi van nhan va~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ((hop tap) OR (hop tai)), nghien huu toan hoc nganh cong thuoc xa hoi van nhan va".
• Adding a wildcard symbol may retrieve word variants: tu cac ((hop tap) OR (hop tai)), nghien huu toan hoc nganh cong thuoc xa hoi van nhan va*.