Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hieu van » hieu va, thien van, lieu va
hang tai » hang va, dung tai
hanh tai » thanh tai, han tai, hinh tai
van than » van thanh, van thang, van tuan
than luc » nhan luc, than duc, thanh luu
lang xa » lang ha, dang xay, lang van
sach ky » sac ky, sach y, sach ty
nang xa » nang x, nang ma, mang xa
tu sach » thu sach, su sach, te sach
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky ((nang xa) or (lang xa)) hoi. hieu van than luc va ((hanh tai) OR (hang tai)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (lang xa)) hoi. hieu van than luc va ((hanh tai) OR (hang tai)) su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang xa) or (lang xa)) hoi. hieu van than luc va ((hanh tai) OR (hang tai)) su triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xa) or (lang xa)) hoi. hieu van than luc va ((hanh tai) OR (hang tai)) su triet*.