Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
cua viet » ca viet, hoa viet, cua vat
hieu ve » hieu va, hieu van
cau luc » cau truc, cau phuc
nang xa » lang xa, nang ma, mang xa
vai cua » dai cua, hai cua, lai cua
cac luc » coc luc, cac nuoc, cac cuoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach y ((nang xa) or (nang x)) hoi. hieu ve ((cac luc) OR (cau luc)) van hanh vai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y ((nang xa) OR (nang x)) hoi. hieu ve ((cac luc) OR (cau luc)) van hanh vai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach y ((nang xa) or (nang x)) hoi. hieu ve ((cac luc) OR (cau luc)) van hanh vai cua viet".
• Adding a wildcard symbol may retrieve word variants: thuat sach y ((nang xa) or (nang x)) hoi. hieu ve ((cac luc) OR (cau luc)) van hanh vai cua viet*.