Perhaps you should try some spelling variations:
phuong doan » phuong loan, phuong hoang, huong dan
dung phuong » dung thuong, bang phuong, dung chung
hanh trinh » canh tranh, hanh chinh
doi chieu » doc hieu, doi chi, mot chieu
ho chieu » theo chieu, hoc thieu, mot chieu
trinh va » trinh van, trinh vat, trinh ve
toan cao » toan ban, toan tap
va dung » van dung, va duong, vat dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chieu) OR (ho chieu)) sang - hanh trinh va dung phuong doan ((doanh tai) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (ho chieu)) sang - hanh trinh va dung phuong doan ((doanh tai) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) OR (ho chieu)) sang - hanh trinh va dung phuong doan ((doanh tai) or (toan cao))".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) OR (ho chieu)) sang - hanh trinh va dung phuong doan ((doanh tai) or (toan cao))*.