Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
luoc can » luc canh, hoc can, luoc dai
tao khoi » tao hoi, thao khoa, lao khoa
hieu van » hieu va, thien van, lieu va
duc van » duc va, duc tan, duc manh
hanh di » hanh vi, hanh de, hang di
van hac » van hoc, van ha, van hai
ky tang » ky nang, ky dang, kho tang
ky sang » ky nang, ky dang, duy sang
di cua » dai cua, doi cua, de cua
te sac » te sach, te cac, te san

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ((ky sang) or (ky tang)) tao khoi. hieu van hac ((duc van) or (luoc can)) hanh di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ((ky sang) OR (ky tang)) tao khoi. hieu van hac ((duc van) OR (luoc can)) hanh di cua triet.
• Adding a wildcard symbol may retrieve word variants: te sac ((ky sang) or (ky tang)) tao khoi. hieu van hac ((duc van) or (luoc can)) hanh di cua triet*.