Perhaps you should try some spelling variations:
cong thuoc » cong thuc, dong thuoc, long thuoc
nganh cong » nhanh chong, thanh cong
cach thoi » cac thoi, cach thuc
hoc nganh » hoc nhanh
toan hoc » toan khoa, van hoc, hoa hoc
van nhan » van phan, van thanh, danh nhan
cach noi » hanh noi, anh noi, cau noi
thuoc va » thuc va, thuoc ma, thuong va
cuu toan » cuu hoan, cua toan, huu toan
hoi van » hoi va, hoi dan, hai van
nhan va » nhan tai, nhan dan, nhan tao
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 noi)) tap, nghien cuu toan hoc nganh cong thuoc va hoi van nhan va~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((cach thoi) OR (cach noi)) tap, nghien cuu toan hoc nganh cong thuoc va hoi van nhan va.
• Adding a wildcard symbol may retrieve word variants: tu ((cach thoi) or (cach noi)) tap, nghien cuu toan hoc nganh cong thuoc va hoi van nhan va*.