Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
tu sach » thu sach, su sach, te sach
ly nang » ky nang, ly vang, ly quang
ly hang » ly quang
cac dac » cac dan, cac dai, cac bac
dac ban » cac ban, dac san, duc ban
tai cua » thai cua, tri cua, dai cua
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: tu sach ((ly nang) or (ly hang)) x hoi. lieu va cac dac ban thanh ((tai cua) OR (tai cuc)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ly nang) OR (ly hang)) x hoi. lieu va cac dac ban thanh ((tai cua) OR (tai cuc)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ly nang) or (ly hang)) x hoi. lieu va cac dac ban thanh ((tai cua) OR (tai cuc)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ly nang) or (ly hang)) x hoi. lieu va cac dac ban thanh ((tai cua) OR (tai cuc)) tre*.