Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hien hanh » dieu hanh
trinh van » trinh han, trinh quan, trinh toan
lang cong » dang cong, bang cong, lang dong
hang cong » dang cong, hang nong, bang cong
tap toan » tap doan, tap quan, bai toan
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien hanh - hanh trinh van ((lang cong) OR (hang cong)) tap toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien hanh - hanh trinh van ((lang cong) OR (hang cong)) tap toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc hien hanh - hanh trinh van ((lang cong) OR (hang cong)) tap toan cao*.