Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hanh hai » thanh hai, nhanh hai, hang hai
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
hai cua » thai cua, dai cua, hoi 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 hai 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 hai 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 hai cua viet*.