Perhaps you should try some spelling variations:
thanh trung » thanh tung
hanh trang » canh tranh, hanh trinh, minh trang
hoac khong » hoa khong, hoc khong, hay khong
hua khong » hoa khong, cua khong, phuc khong
theo chu » theo chieu, cho chu, chao chu
chu xanh » chu manh, chieu xanh, chua xang
cang tac » cong tac, canh tac, sang tac
tac toan » tap toan, tam toan, hach toan
toan cau » 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: theo chu xanh - ((hanh trang) or (thanh trung)) ((hua khong) OR (hoac khong)) cang tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chu xanh - ((hanh trang) OR (thanh trung)) ((hua khong) OR (hoac khong)) cang tac toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chu xanh - ((hanh trang) or (thanh trung)) ((hua khong) OR (hoac khong)) cang tac toan cau".
• Adding a wildcard symbol may retrieve word variants: theo chu xanh - ((hanh trang) or (thanh trung)) ((hua khong) OR (hoac khong)) cang tac toan cau*.