Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
sach ky » sach y, sach ty, sach kem
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va
san cua » sang cua, ban cua, dan cua
sac ky » cac ky, sai ky
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: thuat ((sach ky) OR (sac ky)) lang xa hoi. ((hieu ve) or (hieu van)) giao duc va thanh san cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((sach ky) OR (sac ky)) lang xa hoi. ((hieu ve) OR (hieu van)) giao duc va thanh san cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat ((sach ky) OR (sac ky)) lang xa hoi. ((hieu ve) or (hieu van)) giao duc va thanh san cua tu".
• Adding a wildcard symbol may retrieve word variants: thuat ((sach ky) OR (sac ky)) lang xa hoi. ((hieu ve) or (hieu van)) giao duc va thanh san cua tu*.