Perhaps you should try some spelling variations:
hoc thuyet » hoc chuyen
hoc thiet » hoc thieu, hoc hien, toc thieu
hanh hang » thanh hang, hang hang, hanh han
nang cong » nang song, dang cong, bang cong
cong san » cong tac
toan tai » toan tap, doanh tai, toan cao
toan ban » van ban
hang da » hang dau, hang dam, hoang da
da nang » cam nang, kha nang, cao nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc thiet) OR (hoc thuyet)) tach - hanh hang da nang cong san ((toan tai) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thiet) OR (hoc thuyet)) tach - hanh hang da nang cong san ((toan tai) OR (toan ban))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thiet) OR (hoc thuyet)) tach - hanh hang da nang cong san ((toan tai) or (toan ban))*".