Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
dieu cua » dieu tra
qua cam » qua cham, qua cac, qua ca
cam duc » cam xuc, cao duc, pham duc
duc van » duc va, duc tan, duc manh
doi cua » dai cua, hoi cua
can ky » van ky, dan ky, tan ky
ban ky » van ky, dan ky
x hoi » xa hoi, o hoi, x ho

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((can ky) OR (ban ky)) nang x hoi. hieu qua cam duc van hanh ((dieu cua) OR (doi cua)) te~.
• Adding a wildcard symbol may retrieve word variants: tu ((can ky) or (ban ky)) nang x hoi. hieu qua cam duc van hanh ((dieu cua) or (doi cua)) te*.