Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
va hanh » van hanh, va danh, ban hanh
tu san » thu san, tu ban, tu can
cua te » cua tu
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
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) OR (va thanh)) dai 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) OR (va thanh)) dai 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) OR (va thanh)) dai 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) OR (va thanh)) dai cua te*.