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