Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van khang » van khanh, van thanh, van quang
cau tren » cu tren, dau tren, ca tren
khang di » hang di, khang vi, khang voi
thuc van » thuc vat, thuc dan, thuc va
cam thuc » am thuc, nam thuc, cam thu
su sach » vu sach
hieu va » lieu va, hieu qua
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
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 dang xa hoi. hieu va cam thuc van khang di ((cau tren) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky dang xa hoi. hieu va cam thuc van khang di ((cau tren) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ky dang xa hoi. hieu va cam thuc van khang di ((cau tren) or (cua triet))*.