Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dang xay » dang van, van xay
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
cac tuc » cac toc, cac tu, cac tac
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
lang xa » lang ha, lang van
vi cua » vai cua, di cua
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky ((dang xay) or (lang xa)) hoi. hieu ve cac tuc ((va danh) OR (va hanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((dang xay) OR (lang xa)) hoi. hieu ve cac tuc ((va danh) OR (va hanh)) vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((dang xay) or (lang xa)) hoi. hieu ve cac tuc ((va danh) OR (va hanh)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((dang xay) or (lang xa)) hoi. hieu ve cac tuc ((va danh) OR (va hanh)) vi cua tre*.