Perhaps you should try some spelling variations:
thanh loai » thanh loi, thanh oai, thanh hoai
va thanh » gia thanh, ban thanh, va tinh
su triet » su viet, ve triet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
su tien » su kien, su hien, tu tieng
cac tu » cac thu, cach tu, cac du

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky ((nang ma) or (van xay)) hoi. hieu va cac tu va thanh loai ((su triet) OR (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang ma) OR (van xay)) hoi. hieu va cac tu va thanh loai ((su triet) OR (su tien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang ma) or (van xay)) hoi. hieu va cac tu va thanh loai ((su triet) OR (su tien))".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang ma) or (van xay)) hoi. hieu va cac tu va thanh loai ((su triet) OR (su tien))*.