Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
van hanh » van thanh, ban hanh, van anh
nang cho » nang chon, ngang cho, nang cao
cac vuc » cac nuoc, cac vung, cac cuoc
hanh va » hang va, hanh vi
cac ung » cac chung, cac cong, cac dang
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
va cua » va chua, via cua, ca 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 sach) OR (hoc sach)) ty nang cho hoc. hieu ve ((cac vuc) or (cac ung)) van hanh va cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) ty nang cho hoc. hieu ve ((cac vuc) OR (cac ung)) van hanh va cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (hoc sach)) ty nang cho hoc. hieu ve ((cac vuc) or (cac ung)) van hanh va cua cau*".