Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
cau triet » cau trieu, su triet, cua triet
pham huu » pham duc, pham duy, phan huy
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
ma hoi » mai hoi, xa hoi, ma hoa
vi cau » va cau, ve cau, di cau

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 ky nang ma hoi. hieu ve pham huu ((((van ban) or (ban hanh))) or (van thanh)) vi cau triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ma hoi. hieu ve pham huu ((((van ban) OR (ban hanh))) OR (van thanh)) vi cau triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ma hoi. hieu ve pham huu ((((van ban) or (ban hanh))) or (van thanh)) vi cau triet*.