Perhaps you should try some spelling variations:
lang hoa » hang hoa, lang ha, nang hoa
cuu tre » cua tre, cau tren, cau treo
danh vi » dinh vi, danh di, danh va
ky lang » ky nang, ky dang, ky tang
hoa hoi » khoa hoi, hoa hoc, hoa doi
va chat » van chat, va phat, cao chat
tu cham » toc cham, thi cham
tu sai » tu bai, tu san, tu cai
sai ky » sac ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sai ky lang hoa hoi. hieu ((va chat) or (tu cham)) hoc va ((danh vi) OR (hanh vi)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky lang hoa hoi. hieu ((va chat) OR (tu cham)) hoc va ((danh vi) OR (hanh vi)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sai ky lang hoa hoi. hieu ((va chat) or (tu cham)) hoc va ((danh vi) OR (hanh vi)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sai ky lang hoa hoi. hieu ((va chat) or (tu cham)) hoc va ((danh vi) OR (hanh vi)) cuu tre*.