Perhaps you should try some spelling variations:
lam truoc » lam thuoc, nam truoc, lam truong
ve triet » va trien, su triet
van hanh » van thanh, ban hanh, van anh
cam truc » cau truc, nam truc, nam truoc
hieu va » lieu va, hieu qua
hieu ve » hieu van
nang xa » nang x, lang xa, nang ma
hanh va » hang va, hanh vi
tu sach » thu sach, su sach, te sach
y nang » ky nang, ly nang, v nang
va ve » va de, va le, va vi

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

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