Perhaps you should try some spelling variations:
truong trung » tieng trung
theo chieu » theo tieu, theo chu, thi chieu
trung tuan » trung thanh, trung tam, tran tuan
trong hach » trong mach, trong cach, trong hanh
hach toan » thanh toan, manh toan
ho chieu » hoc thieu, doi chieu, mot chieu
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: ((ho chieu) OR (theo chieu)) xanh - thanh ((trung tuan) or (truong trung)) dung trong hach toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (theo chieu)) xanh - thanh ((trung tuan) OR (truong trung)) dung trong hach toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) OR (theo chieu)) xanh - thanh ((trung tuan) or (truong trung)) dung trong hach toan cau".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) OR (theo chieu)) xanh - thanh ((trung tuan) or (truong trung)) dung trong hach toan cau*.