Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
dong dat » dong vat, dung dat, dong ha
tinh di » tinh doi, trinh di, tinh da
va tinh » may tinh
quoc va » nuoc va, duoc va, quoc gia
dan dat » dung dat, dinh dat, dan hoat
ly hang » ly quang
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: thuoc sach ((ty xang) or (ly hang)) xa hoi. thien ((dan dat) OR (dong dat)) quoc va tinh di cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((ty xang) OR (ly hang)) xa hoi. thien ((dan dat) OR (dong dat)) quoc va tinh di cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ((ty xang) or (ly hang)) xa hoi. thien ((dan dat) OR (dong dat)) quoc va tinh di cua tu".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((ty xang) or (ly hang)) xa hoi. thien ((dan dat) OR (dong dat)) quoc va tinh di cua tu*.