Perhaps you should try some spelling variations:
dung tren » dung trong, dung trung
thanh lai » thanh hai, thanh lap, thanh loi
cau tren » cu tren, dau tren, ca tren
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
duc gia » quoc gia
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 ky nang ma hoi. hieu ve pham duc gia thanh lai ((dung tren) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ma hoi. hieu ve pham duc gia thanh lai ((dung tren) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ma hoi. hieu ve pham duc gia thanh lai ((dung tren) or (cau tren))*.