Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thu sach » tu sach, thuat sach, thuoc sach
van hanh » ban hanh, van anh, van ban
hieu van » hieu va, thien van, lieu va
van cam » van nam, van lam, van cau
cam cuu » cham cuu, cap cuu
ty nang » ky nang, ty hang, ly nang
di cua » dai cua, doi cua, de cua
cua te » cua tu
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: thu sach ((ty nang) or (ty xang)) x hoi. hieu van cam cuu ((van hanh) OR (van thanh)) di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ty nang) OR (ty xang)) x hoi. hieu van cam cuu ((van hanh) OR (van thanh)) di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ty nang) or (ty xang)) x hoi. hieu van cam cuu ((van hanh) OR (van thanh)) di cua te".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ty nang) or (ty xang)) x hoi. hieu van cam cuu ((van hanh) OR (van thanh)) di cua te*.