Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
cua tre » cua te, cuu tre, cua triet
vai cua » dai cua, hai cua, lai cua
thuc va » thuc vat, thuc dan, thuc day
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
nang xa » nang x, nang ma, mang xa
ve cam » ve cham, ve cac, va cam
can ky » van ky, dan ky, ban ky
tuc va » truc va, tuc xa, duc va
tu can » tu ban, tu cac, thu canh

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

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