Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
quoc may » hoc may, duoc ma, quoc oai
dung dat » dung va, dung tai
tinh di » tinh doi, trinh di, tinh da
dan dat » dong dat, dinh dat, dan hoat
ly hang » ly quang
ty hang » ty xang, thi hang, thu hang
di cua » dai cua, doi cua, de cua
cua tu » cua tuc, cua su, cua cu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((ty hang) or (ly hang)) xa hoi. thien ((dan dat) OR (dung dat)) quoc may tinh di cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ty hang) OR (ly hang)) xa hoi. thien ((dan dat) OR (dung dat)) quoc may tinh di cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ty hang) or (ly hang)) xa hoi. thien ((dan dat) OR (dung dat)) quoc may tinh di cua tu".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ty hang) or (ly hang)) xa hoi. thien ((dan dat) OR (dung dat)) quoc may tinh di cua tu*.