Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
trien cua » truyen cua, trien nha, tri cua
tien cua » tiep cua, dien cua, khien cua
so sanh » do sanh
sanh ky » hanh ky, sang ky, nganh ky
cac dac » cac dan, cac dai, cac tac
cac bac » cac bai, cac ban, cac cach
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sanh ky nang x hoi. hieu qua ((cac dac) or (cac bac)) ban thanh ((tien cua) OR (trien cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh ky nang x hoi. hieu qua ((cac dac) OR (cac bac)) ban thanh ((tien cua) OR (trien cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh ky nang x hoi. hieu qua ((cac dac) or (cac bac)) ban thanh ((tien cua) OR (trien cua)) tre".
• Adding a wildcard symbol may retrieve word variants: so sanh ky nang x hoi. hieu qua ((cac dac) or (cac bac)) ban thanh ((tien cua) OR (trien cua)) tre*.