Perhaps you should try some spelling variations:
trinh toan » tinh toan, thanh toan, trinh han
nhieu tang » chieu sang, hieu lang, nhiet nang
hanh hang » thanh hang, hang hang, hanh han
chu xanh » chu manh, chieu xanh, chua xang
cua dong » chua dong, cua cong, cua nong
cua dang » cua cong, cua ban
toan cao » toan ban, toan tap

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: theo ((chu xanh) OR (nhieu tang)) - hanh hang ((cua dong) OR (cua dang)) cong trinh toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chu xanh) or (nhieu tang)) - hanh hang ((cua dong) OR (cua dang)) cong trinh toan cao~".
• Adding a wildcard symbol may retrieve word variants: theo ((chu xanh) or (nhieu tang)) - hanh hang ((cua dong) OR (cua dang)) cong trinh toan cao*.