Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
hoc sach » hoc sinh, hoc cac, hoc anh
nam thuc » nam thuoc, am thuc, nam thu
cau treo » cau theo, cau trieu, cau truc
cau tren » cu tren, dau tren, ca tren
hieu ha » hieu hoa, hieu va, hieu ca
thuc va » thuc vat, thuc dan, thuc day
sach ky » sac ky, sach y, sach ty
dan vai » dan va, dan tai, dan vat
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
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 hoi. hieu ha nam thuc va dan vai ((((cau treo) OR (cau triet))) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky lang xa hoi. hieu ha nam thuc va dan vai ((((cau treo) OR (cau triet))) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ky lang xa hoi. hieu ha nam thuc va dan vai ((((cau treo) OR (cau triet))) or (cau tren))".
• Adding a wildcard symbol may retrieve word variants: hoc sach ky lang xa hoi. hieu ha nam thuc va dan vai ((((cau treo) OR (cau triet))) or (cau tren))*.