Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
tang lai » trang lai, tang tai, tang loi
kham xu » kham xung
ky tang » ky nang, ky dang, kho tang
lai hoi » dai hoi, lai hoa, lai roi
hieu va » lieu va, hieu qua
va kham » va cham, va khao, va tham
doi cua » dai cua, hoi cua
vai cua » dai cua, hai cua, lai cua
tu san » thu san, tu ban, tu can
vi cua » di cua
xu van » tu van, vu van, su van
san ky » sang ky, van ky, dan ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ky tang lai hoi. hieu va kham xu van hanh ((((vi cua) or (vai cua))) or (doi cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky tang lai hoi. hieu va kham xu van hanh ((((vi cua) OR (vai cua))) OR (doi cua)) te.
• Adding a wildcard symbol may retrieve word variants: tu san ky tang lai hoi. hieu va kham xu van hanh ((((vi cua) or (vai cua))) or (doi cua)) te*.