Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trong mach » trong cac, trong minh, trong anh
trinh qua » trinh quan, trinh cua, trinh quang
doc hieu » hoc thieu, hoc hien
qua dung » quang dung, su dung, qua song
toan cao » toan tap
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: ((doc hieu) or (toc thieu)) xanh - hanh trinh qua dung trong mach ((toan cao) OR (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (toc thieu)) xanh - hanh trinh qua dung trong mach ((toan cao) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) or (toc thieu)) xanh - hanh trinh qua dung trong mach ((toan cao) OR (toan ban))".
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (toc thieu)) xanh - hanh trinh qua dung trong mach ((toan cao) OR (toan ban))*.