Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
thanh tai » thanh hai, thanh toan, thanh san
hoang xa » hoang ha, hoang va, hoang xuan
hieu cua » hieu qua, dieu cua, bieu cua
sach ty » sach y, sach tu, sach thu
hang xa » hang va, hang ca, lang xa
ca viet » va viet, co viet, hoa viet
cac bo » bac bo, cac co
bo va » bao va, do va, so va

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

• Performing a fuzzy search may retrieve terms with similar spellings: nuoc sach ty ((hang xa) or (hoang xa)) hoi. hieu cua cac bo va ((thanh tai) OR (doanh tai)) ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nuoc sach ty ((hang xa) OR (hoang xa)) hoi. hieu cua cac bo va ((thanh tai) OR (doanh tai)) ca viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nuoc sach ty ((hang xa) or (hoang xa)) hoi. hieu cua cac bo va ((thanh tai) OR (doanh tai)) ca viet".
• Adding a wildcard symbol may retrieve word variants: nuoc sach ty ((hang xa) or (hoang xa)) hoi. hieu cua cac bo va ((thanh tai) OR (doanh tai)) ca viet*.