Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
van chat » cao chat
thanh ve » hanh ve, thanh va, thanh vien
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
cao hoc » co hoc, cho hoc, chat hoc
va chat » va phat, cao chat, hoa chat
tuc ban » thuc ban, truc ban, tu ban
cua tre » cua te, cuu tre, cua triet
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky nang cao hoc. lieu ((va chat) or (van chat)) tuc ban thanh ve ((cua tre) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang cao hoc. lieu ((va chat) OR (van chat)) tuc ban thanh ve ((cua tre) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang cao hoc. lieu ((va chat) or (van chat)) tuc ban thanh ve ((cua tre) or (cua tu))*.