Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thuc day » thuc dan, thuc vat
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
thuc va » thuc vat, thuc dan
dinh va » dinh van, dinh ve, tinh va
cua tre » cua te, cuu tre, cua triet
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
van am » van nam, van lam, van dam
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky tang xa hoi. hieu van am ((thuc va) or (thuc day)) dinh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky tang xa hoi. hieu van am ((thuc va) OR (thuc day)) dinh va cua tre.
• Adding a wildcard symbol may retrieve word variants: te sac ky tang xa hoi. hieu van am ((thuc va) or (thuc day)) dinh va cua tre*.