Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh dieu » han dieu, hinh dieu, hoang dieu
hieu van » hieu va, thien van, lieu va
dieu cua » dieu tra
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
cam thuc » am thuc, nam thuc, cam thu
sach ky » sach y, sach ty, sach kem
hieu ve » hieu va
nang co » nang cao, nang doc, nang noi
co hoi » co hoc, co loi
sac ky » cac ky, sai ky

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: co ((sach ky) OR (sac ky)) nang co hoi. ((hieu ve) or (hieu van)) cam thuc van hanh dieu cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co ((sach ky) OR (sac ky)) nang co hoi. ((hieu ve) OR (hieu van)) cam thuc van hanh dieu cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co ((sach ky) OR (sac ky)) nang co hoi. ((hieu ve) or (hieu van)) cam thuc van hanh dieu cua triet*".