Perhaps you should try some spelling variations:
cac khoi » cac khoan, cach thoi, hoc khoi
cac thoi » cac toi, cac hop, cac tro
tung dan » dung dan, huong dan, trung dai
va thanh » gia thanh, ban thanh, va tinh
va hanh » van hanh, va danh, ban hanh
cua cau » cua cac, cua chu, cua cay
hieu vu » hieu va, hieu ve, hieu su
dan hoi » dan hoc, dai hoi, van hoi
va cua » va chua, via cua, ca cua
vu cam » vu cham, vu cao, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((cac khoi) or (cac thoi)) tung dan hoi. hieu vu cam xuc ((va hanh) OR (va thanh)) va cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((cac khoi) OR (cac thoi)) tung dan hoi. hieu vu cam xuc ((va hanh) OR (va thanh)) va cua cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((cac khoi) or (cac thoi)) tung dan hoi. hieu vu cam xuc ((va hanh) OR (va thanh)) va cua cau".
• Adding a wildcard symbol may retrieve word variants: tu ((cac khoi) or (cac thoi)) tung dan hoi. hieu vu cam xuc ((va hanh) OR (va thanh)) va cua cau*.