Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
co sach » bo sach, cuon sach, hoc sach
doi cua » dai cua, hoi cua
va danh » va dinh, va dan, va hanh
va nang » van nang, da nang, cam nang
hieu ve » hieu va, hieu van
cac tuc » cac toc, cac tu, cac tac
ve cac » va cac, vien cac
v nang » vu nang, van nang, voi nang
cua te » cua tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: co sach ((v nang) or (va nang)) xa hoi. hieu ve cac tuc ((van hanh) or (va danh)) doi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach ((v nang) OR (va nang)) xa hoi. hieu ve cac tuc ((van hanh) OR (va danh)) doi cua te.
• Adding a wildcard symbol may retrieve word variants: co sach ((v nang) or (va nang)) xa hoi. hieu ve cac tuc ((van hanh) or (va danh)) doi cua te*.