Perhaps you should try some spelling variations:
hanh than » hanh han, hanh nhan, hanh phan
than cua » nhan cua, thai cua, ban cua
dang xay » dang van, van xay
tu sach » thu sach, su sach, te sach
va hanh » van hanh, va thanh, va danh
sach ky » sac ky, sach y, sach ty
hieu va » lieu va
lang xa » lang ha, lang van
cua tre » cua te, cuu tre, cua triet
cac lo » cac lop, cac co, cac bo
lo va » lo van, lao va, ly 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 ((lang xa) or (dang xay)) hoi. ((hieu va) or (hieu qua)) cac lo va hanh than cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((lang xa) OR (dang xay)) hoi. ((hieu va) OR (hieu qua)) cac lo va hanh than cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((lang xa) or (dang xay)) hoi. ((hieu va) or (hieu qua)) cac lo va hanh than cua tre*.