Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
ban hanh » ban hang
su triet » su viet, su tien, ve triet
te sach » toc sach
nang ma » tang ma, sang ma, mang may
thi van » thi lan, thi hanh, thi nang
van anh » van thanh, tuan anh, van minh
dat su » sat su

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y ((nang ma) OR (nang cao)) hoi. thi van nam thuc ((ban hanh) or (van anh)) dat su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((nang ma) OR (nang cao)) hoi. thi van nam thuc ((ban hanh) OR (van anh)) dat su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y ((nang ma) OR (nang cao)) hoi. thi van nam thuc ((ban hanh) or (van anh)) dat su triet".
• Adding a wildcard symbol may retrieve word variants: te sach y ((nang ma) OR (nang cao)) hoi. thi van nam thuc ((ban hanh) or (van anh)) dat su triet*.