Perhaps you should try some spelling variations:
nganh khoa » nganh hoa, nganh khong, doanh khoa
cach thoi » cac thoi, cach thuc, cach noi
hoc nganh » hoc nhanh
tran nhan » tran nhat, tran han, tran thanh
toc cach » hoc cach, toc sach, truoc cach
thoi tap » toi tap, hoc tap, thoi dai
cuu tong » cuu cong, cuu tinh, huu tung
tong hoc » tuong hoc, thong hoc, trong hoc
khoa hoc » hoa hoc
tan nhan » tao nhan, van nhan, ban nhan
va hai » van hai, va chai, va khai

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc cach thoi tap, nghien cuu tong hoc nganh khoa hoc va hai ((tan nhan) OR (tran nhan)) van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc cach thoi tap, nghien cuu tong hoc nganh khoa hoc va hai ((tan nhan) OR (tran nhan)) van".
• Adding a wildcard symbol may retrieve word variants: toc cach thoi tap, nghien cuu tong hoc nganh khoa hoc va hai ((tan nhan) OR (tran nhan)) van*.