Perhaps you should try some spelling variations:
tan thanh » tran thanh, tang thanh, toan thanh
cham duc » pham duc, cham soc, pham duy
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang ha » long ha
hieu va » lieu va, hieu qua
va cham » va chat, va tham
ha hoi » hoa hoi, ha noi, xa hoi
va cua » va chua, via cua, ma cua
ca cua » co cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky lang ha hoi. hieu va cham duc tan thanh ((va cua) or (ca cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang ha hoi. hieu va cham duc tan thanh ((va cua) OR (ca cua)) tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky lang ha hoi. hieu va cham duc tan thanh ((va cua) or (ca cua)) tre*.