Perhaps you should try some spelling variations:
dac khoa » da khoa, dau khoa, cac khoan
dai khoa » da khoa, tai khoa, dai hoa
cham hoc » cham soc, chat hoc, cham hoi
may hoi » may thoi, tay hoi, mai hoi
hieu va » lieu va, hieu qua
va cham » va chat, va tham
va hanh » van hanh, va thanh, va danh
luy tre » luyen tre
tru » truc

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 (dai khoa)) mang may hoi. hieu va cham hoc va hanh vi ((luy tre) or (luu tru))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((dac khoa) OR (dai khoa)) mang may hoi. hieu va cham hoc va hanh vi ((luy tre) OR (luu tru)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((dac khoa) OR (dai khoa)) mang may hoi. hieu va cham hoc va hanh vi ((luy tre) or (luu tru))".
• Adding a wildcard symbol may retrieve word variants: tu ((dac khoa) OR (dai khoa)) mang may hoi. hieu va cham hoc va hanh vi ((luy tre) or (luu tru))*.