Perhaps you should try some spelling variations:
toc cach » hoc cach, toc sach, truoc cach
van hanh » van thanh, ban hanh, van anh
hanh de » hanh ve, hanh kem
cac xuc » cac nuoc, chat xuc, cac cuoc
cua cau » cua cac, cua chu, cua cay
hieu ve » hieu va, hieu van
cho hoc » co hoc, khoa hoc
tu xang » tu lang, tu quang, tct xang
de cua » le cua, te cua, dieu cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc cach ((tu xang) OR (ty xang)) cho hoc. hieu ve ((cac xuc) or (cam xuc)) van hanh de cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc cach ((tu xang) OR (ty xang)) cho hoc. hieu ve ((cac xuc) OR (cam xuc)) van hanh de cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc cach ((tu xang) OR (ty xang)) cho hoc. hieu ve ((cac xuc) or (cam xuc)) van hanh de cua cau*".