Perhaps you should try some spelling variations:
va thuat » ky thuat, ki thuat, va thuc
thanh vi » hanh vi, thanh va, thanh ve
lang van » dang van, tang van, hoang van
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay
loc va » luc va
vi cua » vai cua, di cua
te cao » te bao

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

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