Perhaps you should try some spelling variations:
luoc can » luc canh, luoc dai, duoc cac
sach ky » sac ky, sach y, sach kem
kem cua » em cua, keo cua, diem cua
hoc can » hoc dan, hoc cao, hoc cac
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
ve cam » ve cham, ve cac, va cam
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ky) or (sach ty)) nang x hoi. hieu ve cam ((luoc can) OR (hoc can)) hanh kem cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach ty)) nang x hoi. hieu ve cam ((luoc can) OR (hoc can)) hanh kem cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) or (sach ty)) nang x hoi. hieu ve cam ((luoc can) OR (hoc can)) hanh kem cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sach ty)) nang x hoi. hieu ve cam ((luoc can) OR (hoc can)) hanh kem cua tre*.