Perhaps you should try some spelling variations:
dinh thi » dinh tri
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty lang » tay lang, ty xang, ty hang
lang xa » lang ha, dang xay, lang van
hieu va » hieu qua
cac loc » cac lop, cac toc, cac hoc
va dinh » van dinh, va kinh, va tinh
cua tuc » cua duc, cua thuoc, luat tuc
loc va » hoc va, luc va
cua tu » cua su, cua cu, cua te

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 ty lang xa hoi. ((hieu va) or (lieu va)) cac loc va dinh thi ((cua tu) OR (cua tuc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty lang xa hoi. ((hieu va) OR (lieu va)) cac loc va dinh thi ((cua tu) OR (cua tuc)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty lang xa hoi. ((hieu va) or (lieu va)) cac loc va dinh thi ((cua tu) OR (cua tuc))".
• Adding a wildcard symbol may retrieve word variants: te sach ty lang xa hoi. ((hieu va) or (lieu va)) cac loc va dinh thi ((cua tu) OR (cua tuc))*.