Perhaps you should try some spelling variations:
hien hanh » dieu hanh
hanh nang » anh nang, ganh nang, hanh mang
dung cong » dung trong
toc hien » hoc hien, toc mien, toc thieu
cong tap » cuong tap, cong tac, cong tan
toan cao » toan ban
toan tap » toan ban
nang su » dang su, nang du, nang tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc hien hanh - hanh nang su dung cong tap ((toan cao) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc hien hanh - hanh nang su dung cong tap ((toan cao) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: toc hien hanh - hanh nang su dung cong tap ((toan cao) or (toan tap))*.