Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu dong » thuy dong, tu dong, thu cong
te sach » toc sach
dong xa » dong xay, duong xa, dong ha
hieu va » lieu va
do thuc » hoc thuc, dan thuc
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
vai cua » hai cua, lai cua, bai cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thu dong xa hoi. ((hieu va) OR (hieu qua)) do thuc va hanh ((vai cua) OR (dai cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thu dong xa hoi. ((hieu va) OR (hieu qua)) do thuc va hanh ((vai cua) or (dai cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: te sach thu dong xa hoi. ((hieu va) OR (hieu qua)) do thuc va hanh ((vai cua) or (dai cua)) tre*.