Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
hanh cua » hang cua, hanh sua, doanh cua
manh cua » doanh cua, ban cua
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cam loc » cam lo
loc va » hoc va, luc 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 nang xa hoi. ((hieu van) or (hieu va)) cam loc va ((hanh cua) OR (manh cua)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. ((hieu van) OR (hieu va)) cam loc va ((hanh cua) OR (manh cua)) su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. ((hieu van) or (hieu va)) cam loc va ((hanh cua) OR (manh cua)) su triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. ((hieu van) or (hieu va)) cam loc va ((hanh cua) OR (manh cua)) su triet*.