Perhaps you should try some spelling variations:
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
ho thiet » hoc thiet, hoa thiet, hoc thieu
so thiet » soc thiet, hoc thiet, hoa thiet
bang van » dang van, lang van, bang va
tang van » dang van, hoang van, trong van
luan ban » luan van, luan san, luan han
tinh va » tich va, trinh van, trinh vat

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 tinh va nhung ((bang van) OR (tang van)) luan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho thiet) OR (so thiet)) tach - hanh tinh va nhung ((bang van) OR (tang van)) luan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho thiet) or (so thiet)) tach - hanh tinh va nhung ((bang van) OR (tang van)) luan ban".
• Adding a wildcard symbol may retrieve word variants: ((ho thiet) or (so thiet)) tach - hanh tinh va nhung ((bang van) OR (tang van)) luan ban*.