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
sach ky » sac ky, sach y, sach ty
van cac » van hac, van cau, van bac
nang xa » lang xa, nang ma, mang xa
cua tre » cua te, cuu tre, cua triet
xac va » tac va, ac va, bac va
tuc va » thuc va, truc va, tuc xa

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 ((xac va) or (tuc 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 ((xac va) OR (tuc 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 ((xac va) or (tuc va)) anh cong cua tre*.