Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
lieu tinh » trieu tinh, diep tinh, bien tinh
trinh cua » tinh cua, trinh luat, trinh quan
dang nong » dang cong, tang nong, dang hoang
hang nong » thang long, han tong
manh toan » thanh toan, anh tuan, tinh toan
van toan » van tuan, van tan, van thanh
so lieu » so dieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so lieu tinh - hanh trinh cua ((dang nong) OR (hang nong)) ((van toan) or (manh toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so lieu tinh - hanh trinh cua ((dang nong) OR (hang nong)) ((van toan) OR (manh toan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so lieu tinh - hanh trinh cua ((dang nong) OR (hang nong)) ((van toan) or (manh toan)) cao".
• Adding a wildcard symbol may retrieve word variants: so lieu tinh - hanh trinh cua ((dang nong) OR (hang nong)) ((van toan) or (manh toan)) cao*.