Perhaps you should try some spelling variations:
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
ve chat » van chat
va chat » van chat, va phat, cao chat
su viet » so viet
y nang » ky nang, ly nang, v nang
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: tu sach y nang x hoi. hieu ((ve chat) or (va chat)) xuc ((van ban) or (ban hanh)) vi su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. hieu ((ve chat) OR (va chat)) xuc ((van ban) OR (ban hanh)) vi su viet.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. hieu ((ve chat) or (va chat)) xuc ((van ban) or (ban hanh)) vi su viet*.