Perhaps you should try some spelling variations:
thieu bien » thieu nien, tieu bieu, hien bien
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
sach ky » sac ky, sach y, sach ty
cac vuc » cac vung, cac cuoc, cac quoc
nang ma » tang ma, sang ma, nang cao
hanh co » anh co, danh co, hanh mo
ma hoi » mai hoi, xa hoi, ma hoa
co cua » con cua, ca cua, cong cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (cac ky)) nang ma hoi. thieu bien ((cac vuc) OR (cac nuoc)) van hanh co cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) or (cac ky)) nang ma hoi. thieu bien ((cac vuc) OR (cac nuoc)) van hanh co cua triet~".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (cac ky)) nang ma hoi. thieu bien ((cac vuc) OR (cac nuoc)) van hanh co cua triet*.