Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hieu va » hieu qua
luc ban » duc ban, cuc ban, luc van
luc bat » suc bat, luc nhat, luat bat
nang xa » nang x, lang xa, nang ma
hanh ve » hanh vi, hanh va, hanh kem
san ky » sang ky, van ky, dan ky
tu san » thu san, tu ban, tu can
ve su » va su

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

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