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

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 ban hanh di ((((cua tre) OR (cua te))) 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 ban hanh di ((((cua tre) OR (cua te))) 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 ban hanh di ((((cua tre) OR (cua te))) or (cuu tre))*".