Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cam tuc » cam xuc, cam tu, nam thuc
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, dua tren
hieu va » lieu va, hieu qua
hanh va » hang va, hanh vi
hieu ve » hieu van
va hanh » van hanh, va thanh, va danh
sinh y » sinh ly
tuc va » thuc va, truc va, tuc xa
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sinh y nang ma hoi. ((hieu va) or (hieu ve)) cam tuc va hanh va ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sinh y nang ma hoi. ((hieu va) OR (hieu ve)) cam tuc va hanh va ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sinh y nang ma hoi. ((hieu va) or (hieu ve)) cam tuc va hanh va ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: hoc sinh y nang ma hoi. ((hieu va) or (hieu ve)) cam tuc va hanh va ((cua tre) OR (cua triet))*.