Perhaps you should try some spelling variations:
khoa tang » kho tang, khoa dang, khoa tieng
cac khoa » cac khoan, cac khoi, dac khoa
tang mai » tang ma, tang tai, lang mai
ban hanh » ban hang
cua tre » cua te, cua triet, dua tren
hanh di » hanh vi, hanh de, hang di
cuu tre » cau tren, cau treo
cham so » cham o, ham so, cham hoi
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac khoa tang mai hoi. hieu ve ((cham so) OR (cham soc)) ban hanh di ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac khoa tang mai hoi. hieu ve ((cham so) OR (cham soc)) ban hanh di ((cua tre) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac khoa tang mai hoi. hieu ve ((cham so) OR (cham soc)) ban hanh di ((cua tre) or (cuu tre))*".