Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
thu sach » tu sach, thuat sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
mai khoi » mai khoa, tai khoa, cac khoi
cham lo » cham o, cam lo, cham soc
cuc tre » duc tre, cua tre, cuc thue
ve cham » va cham, ve chat, vu cham
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
mai hoi » dai hoi, lai hoi, mai doi
cuu tre » cua tre, cau tren, cau treo
lo va » lo van, lao va, ly va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang ((mai hoi) or (mai khoi)). hieu ve cham lo va thanh tai ((cuc tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang ((mai hoi) OR (mai khoi)). hieu ve cham lo va thanh tai ((cuc tre) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang ((mai hoi) or (mai khoi)). hieu ve cham lo va thanh tai ((cuc tre) OR (cuu tre))*".