Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
lang mai » lang dai, lang hai, lang man
luoc can » luc canh, luoc dai, duoc cac
hoc can » hoc dan, hoc cao, hoc cac
duc van » duc va, duc tan, duc manh
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
ky lang » ky nang, ky dang, ky tang
ve cac » va cac, vien cac
sac ky » cac ky, sai ky
vi cua » vai cua, di 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 lang mai hoi. hieu ve cac ((duc van) or (((luoc can) or (hoc can)))) hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky lang mai hoi. hieu ve cac ((duc van) OR (((luoc can) OR (hoc can)))) hanh vi cua triet.
• Adding a wildcard symbol may retrieve word variants: te sac ky lang mai hoi. hieu ve cac ((duc van) or (((luoc can) or (hoc can)))) hanh vi cua triet*.