Perhaps you should try some spelling variations:
thanh thai » thanh hai, thanh tai, nhanh thai
van thanh » ban thanh, van tuan
thu sach » tu sach, thuat sach, thuoc sach
sach ky » sac ky, sach y, sach ty
cua tre » cuu tre, cua triet, dua tren
kham lo » pham lao
ve kham » vu kham, va kham, ve cham
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
lo van » le van, vo van, so van
ma hoi » xa hoi, ma hoa, me hoi
cua te » cua tu

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