Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van khang » van khanh, van thanh, van quang
khang di » hang di, khang vi, khang voi
thuc van » thuc vat, thuc dan, thuc va
cam thuc » am thuc, nam thuc, cam thu
cuu tre » cua tre, cau tren, cau treo
su sach » vu sach
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
so sach » so sanh, bo sach, co sach
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (so sach)) ky lang xa hoi. hieu va cam thuc van khang di ((cuu tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky lang xa hoi. hieu va cam thuc van khang di ((cuu tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ky lang xa hoi. hieu va cam thuc van khang di ((cuu tre) or (cua triet))*.