Perhaps you should try some spelling variations:
khoa tang » kho tang, khoa dang, khoa tieng
cac khoa » cac khoan, cac khoi, dac khoa
hang doi » hang di, hang loi, huong doi
hanh doi » thanh doi, hanh noi, hanh moi
cua tre » cua te, cuu tre, cua triet
cham so » cham soc, cham o, cham hoi
hieu ve » hieu va, hieu van
tang ma » mang may, tang van
ham so » nam so, cham soc
ma hoi » mai hoi, xa hoi, ma hoa

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 ma hoi. hieu ve ((cham so) OR (ham so)) ban ((hanh doi) or (hang doi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac khoa tang ma hoi. hieu ve ((cham so) OR (ham so)) ban ((hanh doi) OR (hang doi)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac khoa tang ma hoi. hieu ve ((cham so) OR (ham so)) ban ((hanh doi) or (hang doi)) cua tre*".