Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat, trinh han
hanh trinh » canh tranh, hanh chinh
nhung cong » thong cong, hang cong, nhung don
hoc chieu » hoc thieu, ho chieu, hoc dieu
dung cong » dung trong
ban than » ban thanh, van thanh, ban hang
than cao » toan cao, thai cao, than cap

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

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