Perhaps you should try some spelling variations:
dung tren » dung trong, dung trung
thanh lai » thanh hai, thanh lap, thanh loi
va thanh » gia thanh, ban thanh, va tinh
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
te sach » toc sach
sach ty » sach y, sach tu, sach thu
mai hoi » mai khoi, dai hoi, lai hoi
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
ma hoi » xa hoi, ma hoa, me hoi

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 ty nang ((ma hoi) OR (mai hoi)). hieu ve pham duc va thanh lai ((dung tren) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang ((ma hoi) OR (mai hoi)). hieu ve pham duc va thanh lai ((dung tren) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang ((ma hoi) OR (mai hoi)). hieu ve pham duc va thanh lai ((dung tren) or (cua tre))".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang ((ma hoi) OR (mai hoi)). hieu ve pham duc va thanh lai ((dung tren) or (cua tre))*.