Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
te sach » toc sach
cac toi » cac thoi
hoi cua » hoi chuc
vai cua » dai cua, hai cua, lai cua
xa danh » va danh, dia danh, nam danh
sach ky » sac ky, sach y, sach ty
cac toc » cac nuoc, cac thoi
nang xa » nang x, lang xa, nang ma

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang xa hoi. hieu van ((cac toc) OR (cac toi)) xa danh ((vai cua) or (hoi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang xa hoi. hieu van ((cac toc) OR (cac toi)) xa danh ((vai cua) OR (hoi cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang xa hoi. hieu van ((cac toc) OR (cac toi)) xa danh ((vai cua) or (hoi cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang xa hoi. hieu van ((cac toc) OR (cac toi)) xa danh ((vai cua) or (hoi cua)) tre*.