Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty hang » ly hang, ty xang, thi hang
hang xa » hoang xa, hang va, hang ca
hieu va » hieu qua
cac loc » cac lop, cac toc, cac hoc
va dinh » van dinh, va kinh, va tinh
thi cua » thai cua, tri cua, thi dua
thi cuc » tai cuc
loc va » hoc va, luc 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 ty hang xa hoi. ((hieu va) or (lieu va)) cac loc va dinh ((thi cua) OR (thi cuc)) tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty hang xa hoi. ((hieu va) OR (lieu va)) cac loc va dinh ((thi cua) OR (thi cuc)) tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty hang xa hoi. ((hieu va) or (lieu va)) cac loc va dinh ((thi cua) OR (thi cuc)) tu".
• Adding a wildcard symbol may retrieve word variants: tu sach ty hang xa hoi. ((hieu va) or (lieu va)) cac loc va dinh ((thi cua) OR (thi cuc)) tu*.