Perhaps you should try some spelling variations:
cua triet » su triet, va triet
nang mai » nang ma, nang tai, lang mai
luoc can » luc canh, hoc can, luoc dai
cua viet » ca viet, hoa viet, cua vat
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
duc van » duc va, duc tan, duc manh
te dan » te danh, tre dan, ke dan
dan ky » van ky
ve cac » va cac, vien cac

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

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