Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
hanh moi » thanh moi, hanh noi, hanh mot
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
nam thuc » nam thuoc, am thuc, nam thu
moi cua » hoi cua, doi cua, moi quan
tu sach » thu sach, su sach, te sach
hieu ve » hieu va
lang ha » long ha
nang ma » tang ma, sang ma, nang cao

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

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