Perhaps you should try some spelling variations:
thanh trung » thanh tung
theo chieu » theo tieu, ho chieu, theo chu
chieu xanh » chieu sach, chieu sang, chieu tinh
tran tuan » tran xuan, tran quang, tran thanh
cong tan » cong tac, cong san, cong thanh
tran tap » toan tap, tran tan, trang tai
cap han » cap phan, cap hay, cap van
cap can » cap van, tap can, cap bang

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chieu xanh - thanh trung ((cap han) or (cap can)) cong tan ((tran tap) OR (tran tuan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu xanh - thanh trung ((cap han) OR (cap can)) cong tan ((tran tap) OR (tran tuan)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu xanh - thanh trung ((cap han) or (cap can)) cong tan ((tran tap) OR (tran tuan))".
• Adding a wildcard symbol may retrieve word variants: theo chieu xanh - thanh trung ((cap han) or (cap can)) cong tan ((tran tap) OR (tran tuan))*.