Perhaps you should try some spelling variations:
trinh thiet » trinh viet, trinh thi
hanh trinh » canh tranh, hanh chinh
thiet xung » thuat xung
hoc thieu » toc thieu, hoc hien
xung cong » xuong cong, dung cong, luong cong
ho chieu » theo chieu, doi chieu, mot chieu
bai toan » bai tap
van tan » van tuan, van ban, van tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) or (hoc thieu)) xanh - hanh trinh thiet xung cong ((bai toan) or (van tan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (hoc thieu)) xanh - hanh trinh thiet xung cong ((bai toan) OR (van tan)) cau.
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (hoc thieu)) xanh - hanh trinh thiet xung cong ((bai toan) or (van tan)) cau*.