Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
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
nang xa » nang x, lang xa, nang ma
cao tuc » cao duc, cao suc, cao toc
ki va » khi va, ke va, bi va

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 va trien~.
• 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 va trien.
• 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 va trien*.