Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ky lang » ky nang, ky dang, tay lang
ky tang » ky nang, ky dang, kho tang
hieu va » lieu va, hieu qua
tai son » thai son, tai san, tai so
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, dua tren
te cac » tu cac, ve cac, te cao
va tai » va tac, va tap
son va » song va, son la, lon va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te cac ((ky lang) or (ky tang)) xa hoi. hieu va tai son va hanh vi ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te cac ((ky lang) OR (ky tang)) xa hoi. hieu va tai son va hanh vi ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te cac ((ky lang) or (ky tang)) xa hoi. hieu va tai son va hanh vi ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: te cac ((ky lang) or (ky tang)) xa hoi. hieu va tai son va hanh vi ((cua tre) OR (cua triet))*.