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
ty nang » ky nang, ty xang, ty hang
sach ty » sach y, sach tu, sach thu
di cua » dai cua, doi cua, de cua
cua te » cua tu
va cao » va cac, va co, va dao
va cam » va cham, va cac, va cai
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 x hoi. hieu ((va cam) OR (va cao)) 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 x hoi. hieu ((va cam) OR (va cao)) 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 x hoi. hieu ((va cam) OR (va cao)) cuu ((van hanh) or (van thanh)) di cua te".
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang x hoi. hieu ((va cam) OR (va cao)) cuu ((van hanh) or (van thanh)) di cua te*.