Perhaps you should try some spelling variations:
dinh viet » ninh viet, danh viet, trinh viet
lua tre » cua tre, luy tre, dua tren
dinh vi » dinh ve, dinh tri, dinh thi
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
ve cham » va cham, ve chat, ve chim
vu cham » va cham, vu kham, tu cham
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai 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 sac ky lang xa hoi. hieu ((ve cham) or (vu cham)) hoc va ((dinh vi) OR (dinh viet)) lua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky lang xa hoi. hieu ((ve cham) OR (vu cham)) hoc va ((dinh vi) OR (dinh viet)) lua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky lang xa hoi. hieu ((ve cham) or (vu cham)) hoc va ((dinh vi) OR (dinh viet)) lua tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ky lang xa hoi. hieu ((ve cham) or (vu cham)) hoc va ((dinh vi) OR (dinh viet)) lua tre*.