Perhaps you should try some spelling variations:
ve triet » va trien, su triet
va triet » va thiet, va trien, cua triet
hanh dai » hanh tai, hanh dao, vanh dai
hoc phan » hoc pho
hieu va » lieu va, hieu qua
dong ha » dong hoa, dong va, dong hoc
ky dong » ly dong, ky dang, ky cong
va cao » va cac, va co, va dao
xac ky » cac ky, sac ky, bac ky
ha hoi » hoa hoi, ha noi, xa hoi
su xac » pu xac, su cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: su xac ky dong ha hoi. hieu va cao ((hoc phan) or (hoc dan)) hanh dai ((va triet) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su xac ky dong ha hoi. hieu va cao ((hoc phan) OR (hoc dan)) hanh dai ((va triet) OR (ve triet)).
• Adding a wildcard symbol may retrieve word variants: su xac ky dong ha hoi. hieu va cao ((hoc phan) or (hoc dan)) hanh dai ((va triet) or (ve triet))*.