Perhaps you should try some spelling variations:
san khoa » hang khoa, da khoa, von khoa
tang mai » tang ma, tang tai, lang mai
hieu cao » chieu cao, hieu cac, hieu ca
chat xuc » chat huu, cam xuc, chat cua
ban hang » ngan hang
mai hoi » mai khoi, dai hoi, lai hoi
hang vi » hang va, hanh vi, hang di
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu
toan » tran

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) OR (toan khoa)) tang mai hoi. hieu cao ((chat xuc) or (chao xu)) ban hang vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((san khoa) OR (toan khoa)) tang mai hoi. hieu cao ((chat xuc) OR (chao xu)) ban hang vi cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((san khoa) OR (toan khoa)) tang mai hoi. hieu cao ((chat xuc) or (chao xu)) ban hang vi cua tu".
• Adding a wildcard symbol may retrieve word variants: tu ((san khoa) OR (toan khoa)) tang mai hoi. hieu cao ((chat xuc) or (chao xu)) ban hang vi cua tu*.