Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hieu van » hieu va, thien van, lieu va
hanh va » hang va, hanh vi
thuc va » thuc vat, thuc dan, thuc day
truc va » thuc vat, trung va
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va
y nang » ky nang, ly nang, v nang

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