Perhaps you should try some spelling variations:
ban hanh » ban hang
ve triet » va trien
su triet » su viet, su tien
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ca » hieu cac, hieu cua, hieu xa
hieu va » lieu va, hieu qua
luc ban » duc ban, cuc ban, luc bat

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 nang xa hoi. ((hieu ca) OR (hieu va)) nang luc ban hanh vi ((ve triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. ((hieu ca) OR (hieu va)) nang luc ban hanh vi ((ve triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. ((hieu ca) OR (hieu va)) nang luc ban hanh vi ((ve triet) or (su triet))".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. ((hieu ca) OR (hieu va)) nang luc ban hanh vi ((ve triet) or (su triet))*.