Perhaps you should try some spelling variations:
ngan khong » nganh khong, nhan khong, ngan hang
khong hoc » khung hoc, thong hoc, khong thuoc
hinh hoc » sinh hoc, tin hoc, benh hoc
cuu tong » cuu cong, cuu tinh, huu tung
tong luc » dong luc, tong cuc, truong luc
luc ngan » luc nganh, luc nhan, luat ngan
tu hinh » tu minh, tu hanh, su hinh
va nhan » van nhan, va phan, va nha
ma hoi » mai hoi, xa hoi, ma 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 hinh hoc tap, nghien cuu tong luc ngan khong hoc ma hoi ((va nhan) or (ca nhan)) van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu hinh hoc tap, nghien cuu tong luc ngan khong hoc ma hoi ((va nhan) OR (ca nhan)) van.
• Adding a wildcard symbol may retrieve word variants: tu hinh hoc tap, nghien cuu tong luc ngan khong hoc ma hoi ((va nhan) or (ca nhan)) van*.