Perhaps you should try some spelling variations:
thanh lai » thanh hai, thanh lap, thanh loi
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va chay » va chat, va cham, va cay
dua ban » cua ban, qua ban, mua ban
lai cua » dai cua, hai cua, lai chau
cua tre » cua te, cuu tre, cua triet
sach o » sach lo, sach y, mach o

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