Perhaps you should try some spelling variations:
khoa nganh » khoi nganh, hoc nganh
nganh cong » nhanh chong, thanh cong
cong thuoc » cong thuc, dong thuoc, long thuoc
cach thoi » cac thoi, cach noi
cach thuc » anh thuc, cac thu
cuu toan » cuu hoan, cua toan, huu toan
thuoc va » thuc va, thuoc ma, thuong va
va phan » van phan, va phat, va phap
phan va » phan van, nhan va, han va
va hoi » xa hoi, va hoc, va hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((cach thoi) or (cach thuc)) tap, nghien cuu toan khoa nganh cong thuoc va hoi va phan va~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((cach thoi) OR (cach thuc)) tap, nghien cuu toan khoa nganh cong thuoc va hoi va phan va.
• Adding a wildcard symbol may retrieve word variants: tu ((cach thoi) or (cach thuc)) tap, nghien cuu toan khoa nganh cong thuoc va hoi va phan va*.