Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
dang xay » van xay
nay thuc » nam thuc, cay thuc, day thuc
dang van » hoang van, hang va
cau treo » cau theo, cau tren, cau triet
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, lang van
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
dan vai » dan va, dan tai, dan vat
vai cau » va cau, van cau, vai cac
va nay » va ngay, va cay
va dan » ca dan, va dao, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ky ((lang xa) or (((dang xay) OR (dang van)))) hoi. hieu va nay thuc va dan vai cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky ((lang xa) OR (((dang xay) OR (dang van)))) hoi. hieu va nay thuc va dan vai cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ky ((lang xa) or (((dang xay) OR (dang van)))) hoi. hieu va nay thuc va dan vai cau treo".
• Adding a wildcard symbol may retrieve word variants: hoc sach ky ((lang xa) or (((dang xay) OR (dang van)))) hoi. hieu va nay thuc va dan vai cau treo*.