Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
pham duy » pham duc
nang tao » nang cao, sang tao, nang tai
tao hoi » tao khoi, tao boi, tay hoi
hieu vi » hieu voi, hieu va, hieu ve
duy ban » uy ban, duy van, duy can
co sach » bo sach, cuon sach, hoc sach
tu cach » tu cac
vai va » mai va, dai va, hai va
vi va » vi van, vu va, bi va

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