Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cong cua » cong cu, dong cua, huong cua
anh cong » hanh cong, anh dong, thanh cong
tu sach » thu sach, su sach, te sach
thuc va » thuc vat, thuc dan, thuc day
sach ky » sac ky, sach y, sach ty
nang xa » lang xa, nang ma, mang xa
van cac » van hac, van cau, van bac
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky ((nang xa) or (nang x)) hoi. hieu van cac ((xuc va) or (thuc va)) anh cong cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (nang x)) hoi. hieu van cac ((xuc va) OR (thuc va)) anh cong cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xa) or (nang x)) hoi. hieu van cac ((xuc va) or (thuc va)) anh cong cua tre*.