Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
chieu sach » chinh sach, chiet tach, chieu sang
manh trung » manh tung, thanh trung, manh hung
nam thang » nam thanh, nam trong, nam trung
cong hach » cong sach, cong thanh, cong khanh
hach toan » thanh toan, manh toan
tam hang » pham hang, tam huong, thai hang
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: hoc ((thieu xanh) or (chieu sach)) - manh trung ((tam hang) OR (nam thang)) cong hach toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (chieu sach)) - manh trung ((tam hang) OR (nam thang)) cong hach toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) or (chieu sach)) - manh trung ((tam hang) OR (nam thang)) cong hach toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (chieu sach)) - manh trung ((tam hang) OR (nam thang)) cong hach toan cao*.