Perhaps you should try some spelling variations:
hai cua » thai cua, dai cua, hoi cua
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
sach ly » sach y, sach lo, sach hay
cac luc » cau luc, coc luc, cac nuoc
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet

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

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