Perhaps you should try some spelling variations:
su sach » so sach, vu sach
xang xa » lang xa, mang xa, ang xa
hieu va » lieu va
cau duc » cao duc, cau luc, chu duc
va dinh » van dinh, va kinh, va tinh
vai cua » dai cua, hai cua, lai cua
y xang » ty xang
di cua » dai cua, doi cua, de 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 y xang xa hoi. ((hieu va) OR (hieu qua)) cau duc va dinh ((vai cua) or (di cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y xang xa hoi. ((hieu va) OR (hieu qua)) cau duc va dinh ((vai cua) OR (di cua)) te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y xang xa hoi. ((hieu va) OR (hieu qua)) cau duc va dinh ((vai cua) or (di cua)) te*".