Perhaps you should try some spelling variations:
nganh khoa » nganh hoa, nganh khong, doanh khoa
hoc nganh » hoc nhanh
mach hoc » cach hoc, anh hoc, bac hoc
dich hoc » sinh hoc, hinh hoc, tinh hoc
cuu dong » cuu cong, cuu tong, cuu long
dong hoc » dong co, dong luc
khoa hoc » hoa hoc
van pham » san pham, van phan, van phat
hoc bai » hoc dai, hoc giai
bai hoi » bai choi, bai hoc, dai hoi
hoi van » hoi va, hoi dan, hai van

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((mach hoc) OR (dich hoc)) tap, nghien cuu dong hoc nganh khoa hoc bai hoi van pham van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((mach hoc) OR (dich hoc)) tap, nghien cuu dong hoc nganh khoa hoc bai hoi van pham van".
• Adding a wildcard symbol may retrieve word variants: te ((mach hoc) OR (dich hoc)) tap, nghien cuu dong hoc nganh khoa hoc bai hoi van pham van*.