Perhaps you should try some spelling variations:
hanh dao » lanh dao, thanh dat, thanh dam
hanh dai » hanh tai, vanh dai, thanh dat
tu san » thu san, tu ban, tu can
ve cac » va cac, vien cac
san ky » sang ky, van ky, dan ky
ve cam » ve cham, va cam, ve cai
nang o » nang co, nang ho, nang ro
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 ky nang o hai. hieu ((ve cam) or (ve cac)) duc va ((hanh dai) OR (hanh dao)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky nang o hai. hieu ((ve cam) OR (ve cac)) duc va ((hanh dai) OR (hanh dao)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky nang o hai. hieu ((ve cam) or (ve cac)) duc va ((hanh dai) OR (hanh dao)) cua te".
• Adding a wildcard symbol may retrieve word variants: tu san ky nang o hai. hieu ((ve cam) or (ve cac)) duc va ((hanh dai) OR (hanh dao)) cua te*.