Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
nganh khoa » nganh hoa, nganh khong, doanh khoa
hoc nganh » hoc nhanh
cong hoa » dong hoa, dong hoc, hang hoa
khoa hoc » hoa hoc
tuan san » luan san, tan san, thanh san
hoa tap » khoa tap, hoc tap, hoa tan
mot hoc » mon hoc, mo hoc, mot goc
hoc mai » hoc ma, hoc dai, hoc bai
hoi van » hoi va, hoi dan, hai van
hai tan » hai van, hai quan

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu cong hoa tap, nghien cua mot hoc nganh khoa hoc mai ((hoi van) or (hai tan)) tuan san~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu cong hoa tap, nghien cua mot hoc nganh khoa hoc mai ((hoi van) OR (hai tan)) tuan san.
• Adding a wildcard symbol may retrieve word variants: thu cong hoa tap, nghien cua mot hoc nganh khoa hoc mai ((hoi van) or (hai tan)) tuan san*.