Perhaps you should try some spelling variations:
trung tuan » trung thanh, trung tam, tran tuan
doi chieu » doc hieu, doi chi, ho chieu
trung cua » truong cua, trung cap, dung cua
trong san » trong cac, cong san, dong san
san than » sang than, san thanh, ban than
than cao » toan cao, thai cao, than cap

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: ((doi chieu) OR (toc thieu)) tinh - hanh ((trung cua) OR (trung tuan)) dung trong san than cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) or (toc thieu)) tinh - hanh ((trung cua) OR (trung tuan)) dung trong san than cao~".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (toc thieu)) tinh - hanh ((trung cua) OR (trung tuan)) dung trong san than cao*.