Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh dai » hanh tai, hanh dao, vanh dai
vu khach » vu khanh, vu khac, vay khach
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
cam thuc » am thuc, nam thuc, cam thu
hieu ve » hieu va, hieu van
su sach » so sach, vu sach
nang xa » lang xa, nang ma, mang xa
ve cam » ve cham, ve cac, va cam

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 (vu khach)) v ((nang xa) or (nang x)) hoi. hieu ve cam thuc van hanh dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu khach)) v ((nang xa) OR (nang x)) hoi. hieu ve cam thuc van hanh dai cua triet.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu khach)) v ((nang xa) or (nang x)) hoi. hieu ve cam thuc van hanh dai cua triet*.