Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
cua viet » ca viet, hoa viet, cua vat
hieu va » lieu va, hieu qua
cam luc » cam xuc, cau luc
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
hieu ve » hieu van
lang xa » lang ha, dang xay, lang van
ty lang » tay lang, ty xang, ty hang
luc va » duc va, tuc va, loc 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 lang xa hoi. ((hieu ve) or (hieu va)) cam luc va ((thanh tai) or (hang va)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty lang xa hoi. ((hieu ve) OR (hieu va)) cam luc va ((thanh tai) OR (hang va)) cua viet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty lang xa hoi. ((hieu ve) or (hieu va)) cam luc va ((thanh tai) or (hang va)) cua viet*.