Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thuc dan » thuc hanh, hoc dan, thuc vat
cau treo » cau theo, cau tren, cau triet
dang xay » dang van, van xay
xay hoi » xa hoi, tay hoi, cay phoi
hieu va » hieu qua
sach ty » sach y, sach tu, sach thu
thuc va » thuc vat, thuc day
ty dang » ty xang, ky dang, ty hang
dan vai » dan va, dan tai, dan vat
vai cau » va cau, van cau, vai cac

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: toc sach ty dang xay hoi. ((hieu va) OR (lieu va)) nam ((thuc va) OR (thuc dan)) dan vai cau treo~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty dang xay hoi. ((hieu va) OR (lieu va)) nam ((thuc va) or (thuc dan)) dan vai cau treo~".
• Adding a wildcard symbol may retrieve word variants: toc sach ty dang xay hoi. ((hieu va) OR (lieu va)) nam ((thuc va) or (thuc dan)) dan vai cau treo*.