Perhaps you should try some spelling variations:
thanh kem » hanh kem, thanh ke, thanh ket
toc sach » hoc sach, doc sach, thuoc sach
sang tai » hang tai, sang tao, tang tai
kem cua » em cua, keo cua, diem cua
sach ky » sac ky, sach y, sach ty
ve chat » va chat, van chat
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
cuu va » cuu van

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky ((sang tai) or (nang ma)) hoi. hieu ve chat ((cuu va) OR (cuu ve)) thanh kem cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky ((sang tai) OR (nang ma)) hoi. hieu ve chat ((cuu va) OR (cuu ve)) thanh kem cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky ((sang tai) or (nang ma)) hoi. hieu ve chat ((cuu va) OR (cuu ve)) thanh kem cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ky ((sang tai) or (nang ma)) hoi. hieu ve chat ((cuu va) OR (cuu ve)) thanh kem cua tre*.