Perhaps you should try some spelling variations:
cham luoc » cham soc, khai luoc, kham cuoc
van hanh » van thanh, ban hanh, van anh
luoc van » luoc can, luoc va, luc van
kem cua » em cua, keo cua, diem cua
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, sach thu
o hoc » co hoc, mo hoc, so hoc
o hoi » co hoi, o hai, o hoa

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