Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
sang tao » hang tai
pham duy » pham duc
ve pham » vi pham, v pham, ve phan
vai cua » dai cua, hai cua, lai cua
duy ban » uy ban, duy van, duy can
tu cach » tu cac
tao hoi » tao khoi, tao boi, tay hoi
ky sang » ky nang, ky dang, ky tang
so sach » so sanh, bo sach, co sach
hieu ve » hieu va, hieu van
vi cua » di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (so sach)) ky sang tao hoi. hieu ve pham duy ban thanh ((vi cua) OR (vai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (so sach)) ky sang tao hoi. hieu ve pham duy ban thanh ((vi cua) OR (vai cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (so sach)) ky sang tao hoi. hieu ve pham duy ban thanh ((vi cua) OR (vai cua)) triet".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (so sach)) ky sang tao hoi. hieu ve pham duy ban thanh ((vi cua) OR (vai cua)) triet*.