Perhaps you should try some spelling variations:
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
va thanh » gia thanh, ban thanh, va tinh
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hieu ke » hieu kem, chieu ke, hieu ky
ke phan » ve phan, kenh phan, ke thang
x hoi » xa hoi, o hoi, x ho
vi su » va su, ve su, ki su

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 ty nang x hoi. hieu ke phan tu ((((ban hanh) or (van hanh))) or (va thanh)) vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang x hoi. hieu ke phan tu ((((ban hanh) OR (van hanh))) OR (va thanh)) vi su triet.
• Adding a wildcard symbol may retrieve word variants: su sach ty nang x hoi. hieu ke phan tu ((((ban hanh) or (van hanh))) or (va thanh)) vi su triet*.