Perhaps you should try some spelling variations:
thuat thanh » thuan thanh, thuat than, thuat toan
thanh ky » hanh ky, than ky, thanh tay
hanh va » hang va, hanh vi
hanh ve » hanh vi, hanh kem
cac tac » cac toc, cac bac, cac dac
hieu ve » hieu va, hieu van
cu tren » tu tren, dua tren
ve cac » va cac, vien cac
tac va » tac da, tac xa, tuc va
co hoi » co hoc

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

• If you are trying to use Boolean operators, they must be ALL CAPS: thuat thanh ky nang ((co hoi) OR (co loi)). hieu ve cac tac va ((hanh ve) OR (hanh va)) cu tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat thanh ky nang ((co hoi) or (co loi)). hieu ve cac tac va ((hanh ve) OR (hanh va)) cu tren~".
• Adding a wildcard symbol may retrieve word variants: thuat thanh ky nang ((co hoi) or (co loi)). hieu ve cac tac va ((hanh ve) OR (hanh va)) cu tren*.