Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thu sach » tu sach, thuat sach, thuoc sach
thanh de » hanh de, thanh ve, thanh do
cham duc » pham duc, cham soc, pham duy
cua tre » cuu tre, cua triet, dua tren
duc van » duc va, duc tan, duc manh
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
tang ha » lang ha, tang ma, trung ha
ky tang » ky nang, ky dang, kho tang
thu ban » thu hang
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) or (thu ban)) ky tang ha noi. hieu ve cham duc van thanh de ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thu ban)) ky tang ha noi. hieu ve cham duc van thanh de ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (thu ban)) ky tang ha noi. hieu ve cham duc van thanh de ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (thu ban)) ky tang ha noi. hieu ve cham duc van thanh de ((cua tre) OR (cua te))*.