Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hang tai » hang va
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
van dau » van dao, phan dau
dau duc » dao duc, dang duc, dau nuoc
cua tu » cua tuc, cua su, cua cu

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 dau duc tan ((hang tai) OR (dung tai)) cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (lang xa)) hoi. hieu van dau duc tan ((hang tai) OR (dung tai)) cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang xa) or (lang xa)) hoi. hieu van dau duc tan ((hang tai) OR (dung tai)) cua tu".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xa) or (lang xa)) hoi. hieu van dau duc tan ((hang tai) OR (dung tai)) cua tu*.