Perhaps you should try some spelling variations:
dac khoa » dai khoa, dau khoa, cac khoan
chat soc » cham soc, chat hoc, chat doc
may hoi » may thoi, tay hoi, mai hoi
hieu va » lieu va, hieu qua
va chat » van chat, va phat, cao chat
va hanh » van hanh, va thanh, va danh
luu tre » luu tru, cuu tre, luy tre
soc va » hoc va, loc va, doc va
vi luu » vi lua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((dac khoa) OR (da khoa)) mang may hoi. hieu va chat soc va hanh vi luu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((dac khoa) OR (da khoa)) mang may hoi. hieu va chat soc va hanh vi luu tre".
• Adding a wildcard symbol may retrieve word variants: tu ((dac khoa) OR (da khoa)) mang may hoi. hieu va chat soc va hanh vi luu tre*.