Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
cong cu » chung cu
va danh » va dinh, va dan, va hanh
hac xuc » chat xuc
van hac » van hoc, van ha, van hai
mang xa » lang xa, mang may, dang xay
sach ky » sac ky, sach y, sach ty
cu tre » cu tren, cua tre, cuu tre

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 ((mang xa) or (nang x)) hoi. hieu van hac xuc ((va danh) or (ban hanh)) cong cu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((mang xa) OR (nang x)) hoi. hieu van hac xuc ((va danh) OR (ban hanh)) cong cu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((mang xa) or (nang x)) hoi. hieu van hac xuc ((va danh) or (ban hanh)) cong cu tre*.