Perhaps you should try some spelling variations:
thanh lam » thanh lap, hanh lam, thanh nam
va thanh » gia thanh, ban thanh, va tinh
cham duc » pham duc, cham soc, pham duy
tu sach » thu sach, su sach, te sach
lam cua » nam cua, lam chat
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
dai hoi » dai hoc, dai hai, dai moi
mai hoi » mai khoi, lai hoi, mai doi
ty tang » tay tang, ty hang, ky tang
cua tre » cua te, cuu tre, cua triet

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) or (ty xang)) ((mai hoi) OR (dai hoi)). hieu vu cham duc va thanh lam cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty tang) OR (ty xang)) ((mai hoi) OR (dai hoi)). hieu vu cham duc va thanh lam cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty tang) or (ty xang)) ((mai hoi) OR (dai hoi)). hieu vu cham duc va thanh lam cua tre*".