Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thuc van » thuc vat, thuc dan, thuc va
van hanh » van thanh, ban hanh, van anh
nang ma » tang ma, sang ma, mang may
hieu ve » hieu va, hieu van
hanh di » hanh vi, hanh de, hang di
sac ky » cac ky, sai ky
di cua » dai cua, doi cua, de cua
ve am » va am

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 y) or (sac ky)) ((nang ma) OR (nang cao)) hoi. hieu ve am thuc van hanh di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach y) OR (sac ky)) ((nang ma) OR (nang cao)) hoi. hieu ve am thuc van hanh di cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach y) or (sac ky)) ((nang ma) OR (nang cao)) hoi. hieu ve am thuc van hanh di cua triet".
• Adding a wildcard symbol may retrieve word variants: su ((sach y) or (sac ky)) ((nang ma) OR (nang cao)) hoi. hieu ve am thuc van hanh di cua triet*.