Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
va hanh » van hanh, va thanh, va danh
ve cac » va cac, vien cac
ve cam » ve cham, va cam, ve cai
tu san » thu san, tu can, vu san
nang o » nang co, nang ho, nang ro
tu ban » thu ban, te ban
cua te » cua tu
o hai » co hai, so hai, o lai

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) OR (tu ban)) ky nang o hai. hieu ((ve cam) or (ve cac)) duc va hanh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu san) OR (tu ban)) ky nang o hai. hieu ((ve cam) OR (ve cac)) duc va hanh dai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu san) OR (tu ban)) ky nang o hai. hieu ((ve cam) or (ve cac)) duc va hanh dai cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu san) OR (tu ban)) ky nang o hai. hieu ((ve cam) or (ve cac)) duc va hanh dai cua te*.