Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
cua triet » cua viet, su triet, va triet
dang xay » dang van, van xay
qua nhat » qua hoat, luc nhat, qua hai
sach lo » sach dao, sach doi, sach hoi
xay hoi » xa hoi, tay hoi, cay phoi
dua ban » dia ban, qua ban, mua ban

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach lo) or (sac o)) dang xay hoi. hieu qua nhat ((dua ban) OR (cua ban)) thanh dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach lo) OR (sac o)) dang xay hoi. hieu qua nhat ((dua ban) OR (cua ban)) thanh dai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach lo) or (sac o)) dang xay hoi. hieu qua nhat ((dua ban) OR (cua ban)) thanh dai cua triet".
• Adding a wildcard symbol may retrieve word variants: thu ((sach lo) or (sac o)) dang xay hoi. hieu qua nhat ((dua ban) OR (cua ban)) thanh dai cua triet*.