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
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
thi van » thi lan, thi hanh, thi nang
van anh » van thanh, van minh
ma hoi » mai hoi, xa hoi, ma hoa
dat su » sat su
tuan » quan, tran, luan

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