Perhaps you should try some spelling variations:
dung tren » dung trong, dung trung
thanh lai » thanh hai, thanh lap, thanh loi
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
va thanh » gia thanh, ban thanh, va tinh
ve pham » vi pham, v pham, ve phan
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
cuu tre » cua tre, cau tren, cau treo
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: ((toc sach) OR (hoc sach)) ty nang ma hoi. hieu ve pham duc va thanh lai ((dung tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) ty nang ma hoi. hieu ve pham duc va thanh lai ((dung tren) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (hoc sach)) ty nang ma hoi. hieu ve pham duc va thanh lai ((dung tren) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (hoc sach)) ty nang ma hoi. hieu ve pham duc va thanh lai ((dung tren) or (cuu tre))*.