Perhaps you should try some spelling variations:
thanh do » thanh de, thanh pho, thanh hoa
va triet » va thiet, va trien, ve triet
sach ky » sach y, sach ty, sach kem
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
nam tuc » nam thuc, nam truc, nam tu
tuc gia » tac gia, duc gia, toc gia
sac ky » cac ky, sai ky
va nam » van nam, ha nam, va nay
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: hoc ((sach ky) OR (sac ky)) ((nang xa) or (lang xa)) hoi. lieu va nam tuc gia thanh do va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((sach ky) OR (sac ky)) ((nang xa) OR (lang xa)) hoi. lieu va nam tuc gia thanh do va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((sach ky) OR (sac ky)) ((nang xa) or (lang xa)) hoi. lieu va nam tuc gia thanh do va triet".
• Adding a wildcard symbol may retrieve word variants: hoc ((sach ky) OR (sac ky)) ((nang xa) or (lang xa)) hoi. lieu va nam tuc gia thanh do va triet*.