Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
thanh tai » thanh hai, thanh toan, doanh tai
hieu cua » hieu qua, dieu cua, bieu cua
va thanh » gia thanh, ban thanh, va tinh
hoang xa » hoang ha, hoang va, hoang xuan
ca viet » co viet, hoa viet, san viet
sach ty » sach y, sach tu, sach thu
va viet » hoa viet, san viet, mai viet
hang xa » hang va, hang ca, lang xa
cac do » cac don, cac doi, cac du
do va » do van, 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 do va thanh tai ((ca viet) OR (va 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 do va thanh tai ((ca viet) OR (va 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 do va thanh tai ((ca viet) OR (va viet))".
• Adding a wildcard symbol may retrieve word variants: nuoc sach ty ((hang xa) or (hoang xa)) hoi. hieu cua cac do va thanh tai ((ca viet) OR (va viet))*.