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