Perhaps you should try some spelling variations:
khoa tang » kho tang, khoa tieng, khoa trung
khoa dang » khoa dung, hoa dan, hoa dong
hieu cao » chieu cao, hieu ca, kieu cao
ban hanh » ban hang
hieu cac » hieu luc, hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
vi cua » vai cua, di cua
xu ban » xuc ban, tu ban, vu ban
tu san » thu san, tu ban, tu can
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 san ((khoa tang) or (khoa dang)) mai hoi. ((hieu cao) OR (hieu cac)) chao xu ban hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ((khoa tang) OR (khoa dang)) mai hoi. ((hieu cao) OR (hieu cac)) chao xu ban hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ((khoa tang) or (khoa dang)) mai hoi. ((hieu cao) OR (hieu cac)) chao xu ban hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: tu san ((khoa tang) or (khoa dang)) mai hoi. ((hieu cao) OR (hieu cac)) chao xu ban hanh vi cua te*.