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 luc » cau luc, coc luc, cac nuoc
va dinh » van dinh, va kinh, va tinh
thi cua » thai cua, thi cuc, tri cua
luc va » duc va, tuc va, loc va
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: te sach ty lang xa hoi. ((hieu va) or (lieu va)) cac luc va dinh thi cua tu~.
• 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 luc va dinh thi cua tu.
• Adding a wildcard symbol may retrieve word variants: te sach ty lang xa hoi. ((hieu va) or (lieu va)) cac luc va dinh thi cua tu*.