Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
hang cho » sang cho, hang khoa, phong cho
cac vung » cac ung, cac chung, cach dung
cac vuc » cac nuoc, cac cuoc, cac quoc
vai cua » dai cua, hai cua, lai cua
cua cau » cua cac, cua chu, cua cay
sach ty » sach tu, sach thu, xach tay
hieu ve » hieu va, hieu van
cho hoc » co hoc, khoa hoc

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 ty) or (sach y)) hang cho hoc. hieu ve ((cac vuc) OR (cac vung)) van hanh vai cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ty) OR (sach y)) hang cho hoc. hieu ve ((cac vuc) OR (cac vung)) van hanh vai cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ty) or (sach y)) hang cho hoc. hieu ve ((cac vuc) OR (cac vung)) van hanh vai cua cau*".