Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hang loi » thang loi, hang doi, tang loi
hieu van » hieu va, thien van, lieu va
cua viet » ca viet, hoa viet, cua vat
ky dang » ky nang, ky danh
van cac » van hac, van cau, van bac
ky lang » ky nang, ky tang, tay lang
loi cua » loai cua, hoi cua, doi cua
bac xa » bac ha, tac xa, bac a
buc xa » tuc xa

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 ((ky lang) OR (ky dang)) van hoa. hieu van cac ((bac xa) or (buc xa)) hang loi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((ky lang) OR (ky dang)) van hoa. hieu van cac ((bac xa) OR (buc xa)) hang loi cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ((ky lang) OR (ky dang)) van hoa. hieu van cac ((bac xa) or (buc xa)) hang loi cua viet".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((ky lang) OR (ky dang)) van hoa. hieu van cac ((bac xa) or (buc xa)) hang loi cua viet*.