Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
cam thuc » am thuc, nam thuc, cam thu
hanh di » hanh vi, hanh de, hang di
hieu ve » hieu va, hieu van
su sach » so sach
mang xa » lang xa, mang may, dang xay
vu sach » vu bach, vu khach
ve cam » ve cham, ve cac, va cam
di cua » dai cua, doi cua, de cua

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