Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
toc sach » hoc sach, doc sach, thuoc sach
nay thuc » nam thuc, cay thuc, day thuc
cau tren » cu tren, dau tren, ca tren
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
dau vai » dau va, dau hai, dau tai
va nay » va ngay, va cay
va dau » va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky lang xa hoi. hieu va nay thuc va dau vai ((cau tren) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky lang xa hoi. hieu va nay thuc va dau vai ((cau tren) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: toc sach ky lang xa hoi. hieu va nay thuc va dau vai ((cau tren) or (cua triet))*.