Perhaps you should try some spelling variations:
hieu vuc » hieu tuc, hieu thuc, hieu viec
hieu luc » hieu luat, hieu qua
hanh lai » hanh lam, hanh tai, thanh lap
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
ca viet » va viet, co viet, hoa viet
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
luc va » duc va, tuc va, loc va
lai ca » lai cua, lai cam, loai ca

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 v nang xa hoi. ((hieu vuc) OR (hieu luc)) nang luc va hanh lai ca viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach v nang xa hoi. ((hieu vuc) OR (hieu luc)) nang luc va hanh lai ca viet".
• Adding a wildcard symbol may retrieve word variants: su sach v nang xa hoi. ((hieu vuc) OR (hieu luc)) nang luc va hanh lai ca viet*.