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
coc duc » hoc duc, coc luc, hoc duoc
hieu va » lieu va, hieu qua
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
cua tre » cua te, cuu tre, cua triet
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 tang xa hoi. hieu va coc duc 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 tang xa hoi. hieu va coc duc va ((((tinh vi) OR (trinh do))) OR (trinh vi)) cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky tang xa hoi. hieu va coc duc va ((((tinh vi) or (trinh do))) or (trinh vi)) cua tre*.