Perhaps you should try some spelling variations:
va thuat » ky thuat, ki thuat, va thuc
thanh vi » hanh vi, thanh va, thanh ve
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
cua tre » cuu tre, cua triet, dua tren
ky lang » ky nang, ky dang, ky tang
te cac » tu cac, ve cac, te cao
cua te » cua tu
luc va » duc va, tuc va
loc va » hoc 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 xa hoi. hieu va thuat ((loc va) OR (luc va)) thanh vi ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te cac ky lang xa hoi. hieu va thuat ((loc va) OR (luc va)) thanh vi ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te cac ky lang xa hoi. hieu va thuat ((loc va) OR (luc va)) thanh vi ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: te cac ky lang xa hoi. hieu va thuat ((loc va) OR (luc va)) thanh vi ((cua tre) or (cua te))*.