Perhaps you should try some spelling variations:
cac cuoc » ca cuoc, cac quoc, can cuoc
toc sach » hoc sach, doc sach, thuoc sach
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
nang cho » nang chon, ngang cho, nang cao
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
vai cua » dai cua, hai cua, lai cua
cua cau » cua cac, cua chu, cua cay
hieu ve » hieu va, hieu van
cho hoc » co hoc, khoa hoc
ty nang » ky nang, ty xang, ty hang

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