Perhaps you should try some spelling variations:
thanh tay » thanh tai, thanh toan, thanh thuy
thanh tam » thanh tai, thanh nam, thanh toan
cham duc » pham duc, cham soc, pham duy
tu sach » thu sach, su sach, te sach
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
dai hoi » dai hoc, dai hai, dai moi
ty tang » tay tang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
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: tu sach ty tang ((ma hoi) or (dai hoi)). hieu ve cham duc va ((thanh tam) or (thanh tay)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty tang ((ma hoi) OR (dai hoi)). hieu ve cham duc va ((thanh tam) OR (thanh tay)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty tang ((ma hoi) or (dai hoi)). hieu ve cham duc va ((thanh tam) or (thanh tay)) cua tre*.