Perhaps you should try some spelling variations:
theo chieu » theo tieu, theo chu, thi chieu
hanh trinh » canh tranh, hanh chinh
phan chung » phan cung, phan hung, phan thuong
trinh toan » tinh toan, thanh toan, trinh han
ho chieu » hoc thieu, mot chieu, doi chieu
phan ung » phan xuong, phan cong
toan tap » toan ban

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (theo chieu)) xanh - hanh trinh ((phan chung) OR (phan ung)) cong trinh toan tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) OR (theo chieu)) xanh - hanh trinh ((phan chung) or (phan ung)) cong trinh toan tap~".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) OR (theo chieu)) xanh - hanh trinh ((phan chung) or (phan ung)) cong trinh toan tap*.