Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
va trien » va truyen, va thiet, va tuyen
cac van » cac dan
thu sac » thu sach, thu san, thu xac
cac ban » cac dan, can ban, cac bai
va nhan » van nhan, ca nhan, va phan
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sac ky nang xa hoi. hieu va nhan ((cac ban) OR (cac van)) hanh vi ((va trien) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky nang xa hoi. hieu va nhan ((cac ban) OR (cac van)) hanh vi ((va trien) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sac ky nang xa hoi. hieu va nhan ((cac ban) OR (cac van)) hanh vi ((va trien) or (su triet))".
• Adding a wildcard symbol may retrieve word variants: thu sac ky nang xa hoi. hieu va nhan ((cac ban) OR (cac van)) hanh vi ((va trien) or (su triet))*.