Perhaps you should try some spelling variations:
van thanh » ban thanh
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
van hanh » ban hanh, van anh, van ban
van tuan » van quan, van ban, anh tuan
so sach » so sanh, bo sach, co sach
tai cua » thai cua, tai cuc, tri cua
y nang » ky nang, ly nang, v nang
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: so sach y nang x hoi. hieu van pham duc ((van hanh) or (((van thanh) OR (van tuan)))) tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang x hoi. hieu van pham duc ((van hanh) OR (((van thanh) OR (van tuan)))) tai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang x hoi. hieu van pham duc ((van hanh) or (((van thanh) OR (van tuan)))) tai cua te".
• Adding a wildcard symbol may retrieve word variants: so sach y nang x hoi. hieu van pham duc ((van hanh) or (((van thanh) OR (van tuan)))) tai cua te*.