Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
thu sac » thu sach, thu san, thu xac
van cam » van lam, van cau, van dam
hanh di » hanh vi, hanh de, hang di
sac ky » cac ky, sai ky
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 sac ky nang x hoi. hieu ((van cam) or (van nam)) cuu van hanh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky nang x hoi. hieu ((van cam) OR (van nam)) cuu van hanh di cua te.
• Adding a wildcard symbol may retrieve word variants: thu sac ky nang x hoi. hieu ((van cam) or (van nam)) cuu van hanh di cua te*.