Perhaps you should try some spelling variations:
cac thoi » cac toi, cac hop, cac tro
tang dan » tang van, tung dan, tang luan
hoc khoi » hoc khoa, hoc hoa, hoc noi
va hanh » van hanh, va thanh, va danh
dan hoi » dan hoc, dai hoi, van hoi
hieu vu » hieu va, hieu ve, hieu su
xuc va » duc va, tuc va, luc va
vi qua » vi quan, vi lua, viet qua
vu cam » vu cham, vu cao, va cam
va qua » va quan, va quy, va quang

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 thoi)) tang dan hoi. hieu vu cam xuc va hanh ((vi qua) OR (va qua)) su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((hoc khoi) OR (cac thoi)) tang dan hoi. hieu vu cam xuc va hanh ((vi qua) OR (va qua)) su.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((hoc khoi) or (cac thoi)) tang dan hoi. hieu vu cam xuc va hanh ((vi qua) OR (va qua)) su".
• Adding a wildcard symbol may retrieve word variants: tu ((hoc khoi) or (cac thoi)) tang dan hoi. hieu vu cam xuc va hanh ((vi qua) OR (va qua)) su*.