Perhaps you should try some spelling variations:
sach ty » sach tu, sach thu, xach tay
tang xa » trang xa, tang ma, lang xa
hieu va » lieu va
va tinh » may tinh
tinh vi » trinh vi, tinh voi, tinh va
cua tre » cua te, cuu tre, cua triet
co duc » co duoc, cao duc, do duc
vi cua » vai cua, di cua

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