Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
tinh va » tich va, trinh van, trinh vat
va tinh » may tinh
coc tuc » coc luc, hoc thuc, doc thuc
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
tuc va » thuc va, truc va, tuc xa
cua tu » cua tuc, cua cu, cua te
cua su » qua su

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

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