Perhaps you should try some spelling variations:
hoc nganh » hoc nhanh
cua triet » cua viet, su triet, va triet
nang xa » nang x, lang xa, mang xa
doan vi » doan va, don vi, doan thi
va doan » va doanh, van doan, va dan
cac tac » cac toc, cac bac, cac dac
cac tuc » cac toc, cac tu, cac nuoc
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc nganh y ((nang xa) OR (nang ma)) hoi. hieu ve ((cac tuc) or (cac tac)) va doan vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc nganh y ((nang xa) OR (nang ma)) hoi. hieu ve ((cac tuc) OR (cac tac)) va doan vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc nganh y ((nang xa) OR (nang ma)) hoi. hieu ve ((cac tuc) or (cac tac)) va doan vi cua triet".
• Adding a wildcard symbol may retrieve word variants: hoc nganh y ((nang xa) OR (nang ma)) hoi. hieu ve ((cac tuc) or (cac tac)) va doan vi cua triet*.