Perhaps you should try some spelling variations:
thanh trung » thanh tung
hanh trung » hanh trang, manh trung, danh trung
cua khoang » cua khong, cua hang, da khoang
trong tan » trong quan, trong cac, trong ca
chi xanh » chi anh, chi danh, chi hanh
cua khoa » chua khoa, sua khoa, qua khoa
tan toan » tan tran, tap toan, van toan
toan cao » toan ban, toan tap
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chi xanh - ((hanh trung) or (thanh trung)) ((cua khoang) OR (cua khoa)) trong tan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi xanh - ((hanh trung) OR (thanh trung)) ((cua khoang) OR (cua khoa)) trong tan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chi xanh - ((hanh trung) or (thanh trung)) ((cua khoang) OR (cua khoa)) trong tan toan cao".
• Adding a wildcard symbol may retrieve word variants: doi chi xanh - ((hanh trung) or (thanh trung)) ((cua khoang) OR (cua khoa)) trong tan toan cao*.