Perhaps you should try some spelling variations:
ban hanh » ban hang
nam thuc » nam thuoc, am thuc, nam thu
sach ky » sach y, sach ty, sach kem
van anh » van thanh, tuan anh, van minh
thi van » thi lan, thi hanh, thi nang
sang ma » tang ma, nang ma, sang tao
su viet » so viet
sac ky » cac ky, sai ky
da su » dan su, dat su, va 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 ky) or (sac ky)) sang ma hoa. thi van nam thuc ((ban hanh) or (van anh)) da su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sac ky)) sang ma hoa. thi van nam thuc ((ban hanh) OR (van anh)) da su viet.
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sac ky)) sang ma hoa. thi van nam thuc ((ban hanh) or (van anh)) da su viet*.