Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
ban thanh » ban hanh, ban hang
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
va triet » va thiet, va trien, ve triet
van cac » van hac, van cau, van bac
cac dac » cac dan, cac dai, cac bac
dac ban » cac ban, dac san, duc ban
y nang » ky nang, ly nang, v nang
dai va » mai va

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

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