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
tinh vi » trinh vi, tinh voi, tinh va
va tinh » may tinh
cuu tre » cua tre, cau tren, cau treo
hieu va » hieu qua
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
luc va » duc va, tuc va, loc va

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) OR (lieu va)) coc luc va tinh vi ((cua triet) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky dang xa hoi. ((hieu va) OR (lieu va)) coc luc va tinh vi ((cua triet) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky dang xa hoi. ((hieu va) OR (lieu va)) coc luc va tinh vi ((cua triet) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: su sach ky dang xa hoi. ((hieu va) OR (lieu va)) coc luc va tinh vi ((cua triet) or (cuu tre))*.