Perhaps you should try some spelling variations:
tan thanh » tran thanh, tang thanh, toan thanh
thanh hai » thanh phan, thanh hoa, thanh san
cao hoi » cau hoi, co hoi, tao hoi
cao hoc » co hoc, cho hoc, chat hoc
hieu va » lieu va
cam duc » cam xuc, cao duc, pham duc
hai cua » thai cua, dai cua, hoi cua
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky
cua te » cua tu

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