Perhaps you should try some spelling variations:
thien van » thi van
sach vay » sach va, sach hay, sach nay
thanh do » thanh pho, thanh hoa, thanh loi
thanh de » hanh de, thanh ve, thanh le
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
ha duc » ho duc, ha dac, xa duc
ma hoi » mai hoi, xa hoi, ma hoa
van ha » van hoa, van chat, van hanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((sach vay) or (sach y)) nang ma hoi. thien van ha duc ban ((thanh de) OR (thanh do)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach vay) OR (sach y)) nang ma hoi. thien van ha duc ban ((thanh de) OR (thanh do)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach vay) or (sach y)) nang ma hoi. thien van ha duc ban ((thanh de) OR (thanh do)) cua tre".
• Adding a wildcard symbol may retrieve word variants: toc ((sach vay) or (sach y)) nang ma hoi. thien van ha duc ban ((thanh de) OR (thanh do)) cua tre*.