Perhaps you should try some spelling variations:
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
su triet » su viet, su tien, ve triet
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve phan » va phan, ke phan, ve phat
va tinh » may tinh
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: so sach ty nang xa hoi. hieu ve phan tu ((((ban hanh) or (van hanh))) or (va tinh)) vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty nang xa hoi. hieu ve phan tu ((((ban hanh) OR (van hanh))) OR (va tinh)) vi su triet.
• Adding a wildcard symbol may retrieve word variants: so sach ty nang xa hoi. hieu ve phan tu ((((ban hanh) or (van hanh))) or (va tinh)) vi su triet*.