Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, dua tren
dinh ve » dinh ket, dinh van
danh vi » hanh vi, dinh vi, danh di
tu sach » thu sach, su sach, te sach
cam cac » ca cac, nam cac, cam chan
hieu ve » hieu va, hieu van
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
cac ban » cac dan, cac van, can ban
ve cam » ve cham, ve cac, 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 sach ky dang xa hoi. hieu ve cam cac ban ((danh vi) or (dinh ve)) ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang xa hoi. hieu ve cam cac ban ((danh vi) OR (dinh ve)) ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang xa hoi. hieu ve cam cac ban ((danh vi) or (dinh ve)) ((cua tre) or (cua triet))*.