Perhaps you should try some spelling variations:
hoc khoi » hoc khoa, hoc hoa, hoc noi
tang dan » tang van, tung dan, tang luan
dan hoi » dan hoc, dai hoi, van hoi
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va
vi cua » vai cua, di cua
cua su » qua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((hoc khoi) or (cac tro)) tang dan hoi. hieu va cam xuc va hanh vi cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((hoc khoi) OR (cac tro)) tang dan hoi. hieu va cam xuc va hanh vi cua su.
• Adding a wildcard symbol may retrieve word variants: tu ((hoc khoi) or (cac tro)) tang dan hoi. hieu va cam xuc va hanh vi cua su*.