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
trung cam » trung tam, trung cap, trung nam
hang cong » dang cong, hang nong, bang cong
cam hang » cam hoang, cam nang, cam hung
tac toan » tam toan, hach toan, tich toan
tap toan » tap doan, tap quan, bai toan

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 cam hang cong ((tac toan) OR (tap toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (chieu sach)) - manh trung cam hang cong ((tac toan) OR (tap toan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) or (chieu sach)) - manh trung cam hang cong ((tac toan) OR (tap toan)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (chieu sach)) - manh trung cam hang cong ((tac toan) OR (tap toan)) cao*.