Perhaps you should try some spelling variations:
cham xuc » cam xuc, chat xuc, cham soc
dau cua » dai cua, day cua, cau cua
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
cao hoc » co hoc, cho hoc, chat hoc
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
va dau » va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((sac ky) or (sach ty)) nang cao hoc. hieu ve cham xuc ((va hanh) or (va dau)) dau cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sac ky) OR (sach ty)) nang cao hoc. hieu ve cham xuc ((va hanh) OR (va dau)) dau cua tre.
• Adding a wildcard symbol may retrieve word variants: toc ((sac ky) or (sach ty)) nang cao hoc. hieu ve cham xuc ((va hanh) or (va dau)) dau cua tre*.