Perhaps you should try some spelling variations:
hanh hang » thanh hang, hang hang, hanh han
nang cong » nang song, dang cong, bang cong
ho thiet » hoc thiet, hoa thiet, hoc thieu
so thiet » soc thiet, hoc thiet, hoa thiet
cong dan » cong san, cong tan, huong dan
toan tai » toan tap, doanh tai, toan cao
toan ban » van ban
va nang » van nang, da nang, cam nang

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

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