Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
thanh dai » thanh hai, thanh dat, thanh oai
qua chat » qua nhat, qua cham, luan chat
chat dua » chat cua, chat lua, chay dua
lang xa » lang ha, dang xay, lang van
sach lo » sach dao, sach doi, sach hoi
dua ban » dia ban, cua ban, qua ban
cua tre » cua te, cuu tre, cua triet

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)) lang xa hoi. hieu qua chat dua ban ((thanh dai) OR (thanh tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach lo) OR (sac o)) lang xa hoi. hieu qua chat dua ban ((thanh dai) OR (thanh tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach lo) or (sac o)) lang xa hoi. hieu qua chat dua ban ((thanh dai) OR (thanh tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thu ((sach lo) or (sac o)) lang xa hoi. hieu qua chat dua ban ((thanh dai) OR (thanh tai)) cua tre*.