Perhaps you should try some spelling variations:
trinh chat » tinh chat, trinh luat, trinh han
hanh trinh » canh tranh, hanh chinh
nhung cong » thong cong, hang cong, nhung don
hoc thieu » toc thieu
dung cong » dung trong
tac toan » tap toan, tam toan, hach toan
toan cao » toan ban, toan tap

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

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