Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
doc sach » hoc sach, toc sach, nuoc sach
thanh vi » hanh vi, thanh va, thanh ve
ve triet » va trien, su triet
duc ban » duc tan, duc van, dua ban
y nang » ky nang, ly nang, v nang
ve cac » vien cac
cua tu » cua tuc, cua su, cua cu
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach y nang x hoi. hieu ((va cac) or (ve cac)) duc ban thanh vi ((cua tu) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach y nang x hoi. hieu ((va cac) OR (ve cac)) duc ban thanh vi ((cua tu) OR (ve triet)).
• Adding a wildcard symbol may retrieve word variants: doc sach y nang x hoi. hieu ((va cac) or (ve cac)) duc ban thanh vi ((cua tu) or (ve triet))*.