Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
suat huong » luat huong, sat huong, luat thuong
hieu manh » chieu xanh, hieu nganh, dieu hanh
suat dung » thuat dung, xuat duong, su dung
hoc hieu » hoc thieu, hoc hien, doc hieu
toan cau » toan cao, toan tap, toan tai
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu manh - hanh trinh ((suat dung) OR (suat huong)) huong dan ((toan cau) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - hanh trinh ((suat dung) OR (suat huong)) huong dan ((toan cau) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu manh - hanh trinh ((suat dung) OR (suat huong)) huong dan ((toan cau) or (toan ban))".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - hanh trinh ((suat dung) OR (suat huong)) huong dan ((toan cau) or (toan ban))*.