Perhaps you should try some spelling variations:
luyen tre » luyen tri, huyen tren, tuyen tren
khoa mang » khoa dang, khoa mong, khoai lang
dac khoa » da khoa, dai khoa, dau khoa
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
tu dac » thu dac, tu cac, tu dat
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 mang may hoi. hieu va cham hoc va hanh vi ((luyen tre) or (luu tru))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu dac khoa mang may hoi. hieu va cham hoc va hanh vi ((luyen tre) OR (luu tru)).
• Adding a wildcard symbol may retrieve word variants: tu dac khoa mang may hoi. hieu va cham hoc va hanh vi ((luyen tre) or (luu tru))*.