Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
cac tuc » cac toc, cac tu, cac nuoc
hoc anh » hoc nganh, hoc nhanh, ngoc anh
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
cac tac » cac toc, cac bac, cac dac
anh ky » hanh ky, anh y, anh my
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va

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

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