Perhaps you should try some spelling variations:
trinh vi » trinh va, trinh ve, trinh viet
trinh do » trinh ky
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
tinh vi » tinh voi, tinh va, dinh vi
hieu va » lieu va, hieu qua
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va
va coc » va cuoc, va cac, va hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky dang xa hoi. hieu va coc luc va ((((tinh vi) or (trinh do))) or (trinh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky dang xa hoi. hieu va coc luc va ((((tinh vi) OR (trinh do))) OR (trinh vi)) cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky dang xa hoi. hieu va coc luc va ((((tinh vi) or (trinh do))) or (trinh vi)) cua tre*.