Perhaps you should try some spelling variations:
ban hanh » ban hang
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
hieu va » lieu va
sat ban » sao ban, sat van, bat ban
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
y lang » o lang, _ lang, tay lang
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 lang xa hoi. ((hieu va) OR (hieu qua)) khao sat ban hanh di cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y lang xa hoi. ((hieu va) OR (hieu qua)) khao sat ban hanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach y lang xa hoi. ((hieu va) OR (hieu qua)) khao sat ban hanh di cua tre*.