Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cam thuc » am thuc, nam thuc, cam thu
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
nang xa » lang xa, nang ma, mang xa
hieu ve » hieu va, hieu van
hanh di » hanh vi, hanh de, hang di
sach v » sach va, sach 2, sach vay
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 v) OR (sach y)) ((nang 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 v) OR (sach y)) ((nang xa) OR (nang x)) hoi. hieu ve cam thuc van hanh di cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach v) OR (sach y)) ((nang xa) or (nang x)) hoi. hieu ve cam thuc van hanh di cua triet".
• Adding a wildcard symbol may retrieve word variants: su ((sach v) OR (sach y)) ((nang xa) or (nang x)) hoi. hieu ve cam thuc van hanh di cua triet*.