Perhaps you should try some spelling variations:
cua triet » su triet, va triet
hanh sua » hinh su, hanh va, hanh tu
cua viet » ca viet, hoa viet, cua vat
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
y nang » ky nang, ly nang, v nang
ve cau » ke cau, va cau, ve cac
luc va » tuc va, loc 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 y nang xa hoi. hieu ve cau ((luc va) OR (duc va)) hanh sua ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. hieu ve cau ((luc va) OR (duc va)) hanh sua ((cua triet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang xa hoi. hieu ve cau ((luc va) OR (duc va)) hanh sua ((cua triet) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. hieu ve cau ((luc va) OR (duc va)) hanh sua ((cua triet) or (cua viet))*.