Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
luoc can » luc canh, hoc can, luoc dai
hieu van » hieu va, thien van, lieu va
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, dua tren
van cac » van hac, van cau, van bac
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
san ky » sang ky, van ky, dan ky
ma hoi » mai hoi, xa hoi, ma hoa
te san » te ban, ke san, tu 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 san ky sang ma hoi. hieu van cac ((duc van) or (luoc can)) hanh vi ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te san ky sang ma hoi. hieu van cac ((duc van) OR (luoc can)) hanh vi ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te san ky sang ma hoi. hieu van cac ((duc van) or (luoc can)) hanh vi ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: te san ky sang ma hoi. hieu van cac ((duc van) or (luoc can)) hanh vi ((cua tre) OR (cua triet))*.