Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
dong xay » dang xay, cong xay, mong xay
tu sach » su sach, te sach, tu cach
va danh » va dan, va hanh, dia danh
sai cua » dai cua, hai cua, lai cua
va dinh » van dinh, va kinh, va tinh
cac xuc » cam xuc, cac nuoc, chat xuc
hieu va » lieu va, hieu qua
xay hoi » xa hoi, tay hoi, cay phoi
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: ((tu sach) or (thu sach)) tu dong xay hoi. hieu va cac xuc ((va danh) OR (va dinh)) sai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) tu dong xay hoi. hieu va cac xuc ((va danh) OR (va dinh)) sai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) tu dong xay hoi. hieu va cac xuc ((va danh) OR (va dinh)) sai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) tu dong xay hoi. hieu va cac xuc ((va danh) OR (va dinh)) sai cua tre*.