Perhaps you should try some spelling variations:
lieu tinh » trieu tinh, diep tinh, bien tinh
canh manh » lanh manh, canh tranh, cach mang
bang cong » dang cong, bang song, hang cong
dung cong » dung trong
luan phan » luan van
luan hoan » luan van
manh cua » doanh cua, ban cua
ho lieu » so lieu, co lieu, ho kieu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ho lieu tinh - canh manh cua ((bang cong) OR (dung cong)) ((luan phan) OR (luan hoan)) cach~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho lieu tinh - canh manh cua ((bang cong) or (dung cong)) ((luan phan) OR (luan hoan)) cach~".
• Adding a wildcard symbol may retrieve word variants: ho lieu tinh - canh manh cua ((bang cong) or (dung cong)) ((luan phan) OR (luan hoan)) cach*.