Perhaps you should try some spelling variations:
thanh lai » thanh hai, thanh lap, thanh loi
van pham » san pham, van phan, van phat
toc sach » hoc sach, doc sach, thuoc sach
phan lap » phan dau
hieu van » hieu va, thien van, lieu va
duc ban » duc tan, duc van, dua ban
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa

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

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