Perhaps you should try some spelling variations:
hanh ki » hanh vi, hanh ky, hanh kien
va hanh » van hanh, va thanh, va danh
dao tuc » dao duc
sach ky » sac ky, sach ty, sach kem
cao tuc » cao duc, cao suc, cao toc
nang xa » nang x, lang xa, nang ma
su viet » so viet
ki su » ky su

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ky) or (sach y)) nang xa hoi. lieu va ((cao tuc) or (dao tuc)) va hanh ki su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach y)) nang xa hoi. lieu va ((cao tuc) OR (dao tuc)) va hanh ki su viet.
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sach y)) nang xa hoi. lieu va ((cao tuc) or (dao tuc)) va hanh ki su viet*.