Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
toc sach » hoc sach, doc sach, thuoc sach
thuc dan » thuc hanh, hoc dan, thuc vat
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 day
dan vai » dan va, dan tai, dan vat
vai cau » va cau, van cau, vai cac
va nam » van nam, ha nam, va nay

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 nam ((thuc va) or (thuc dan)) dan vai cau triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky lang xa hoi. hieu va nam ((thuc va) OR (thuc dan)) dan vai cau triet.
• Adding a wildcard symbol may retrieve word variants: toc sach ky lang xa hoi. hieu va nam ((thuc va) or (thuc dan)) dan vai cau triet*.