Perhaps you should try some spelling variations:
danh doi » danh di, thanh doi, dung doi
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
va danh » va dinh, va dan, va hanh
vu cham » va cham, vu kham, tu cham
ve chat » va chat, van chat
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
san ky » sang ky, van ky, dan ky
tu san » thu san, tu ban, tu can

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

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