Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
cua tre » cua te, cuu tre, cua triet
lang xa » dang xay, lang van
lang ha » long ha
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
vi cua » vai cua, di cua
tu san » thu san, tu ban, tu can
tuc va » truc va, tuc xa, duc va
san ky » sang ky, van ky, dan ky
va cam » va cham, va cac, va cao

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky ((lang xa) OR (lang ha)) hoi. hieu va cam ((tuc va) OR (thuc va)) thanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky ((lang xa) or (lang ha)) hoi. hieu va cam ((tuc va) OR (thuc va)) thanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu san ky ((lang xa) or (lang ha)) hoi. hieu va cam ((tuc va) OR (thuc va)) thanh vi cua tre*.