Perhaps you should try some spelling variations:
thanh di » thanh doi, thanh de, thanh do
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky
co hai » co dai, co hoi, so hai
va cao » va cac, va dao, va bao
di cua » dai cua, doi cua, de cua
cua te » cua tu
o hai » so hai, o lai, _ hai
va co » vo co
gia » giao

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