Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » hieu qua
coc duc » hoc duc, coc luc, hoc duoc
va tinh » may tinh
tinh vi » trinh vi, tinh voi, tinh va
cua tre » cua te, cuu tre, dua tren

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 lang xa hoi. ((hieu va) or (lieu va)) coc duc va tinh vi ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang xa hoi. ((hieu va) OR (lieu va)) coc duc va tinh vi ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: su sach ky lang xa hoi. ((hieu va) or (lieu va)) coc duc va tinh vi ((cua tre) or (cua triet))*.