Perhaps you should try some spelling variations:
dang thanh » dong thanh, dang hanh, hoang thanh
hanh trinh » canh tranh, hanh chinh
trinh cua » tinh cua, trinh luat, trinh quan
dung cong » dung trong
lang toan » dang toan, lang thang, lang thanh
theo yeu » theo tieu, thiet yeu, theo chu
yeu tinh » yeu tin, lieu tinh, kieu tinh

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

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