Perhaps you should try some spelling variations:
va hanh » van hanh, va thanh, va danh
cao luc » bao luc, cao duc, cao suc
hieu va » lieu va, hieu qua
su sach » so sach
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
vu sach » vu bach, vu khach
luc va » duc va, tuc va, loc va
cat va » cat van, dat va, vat va
va cao » va cac, va co, va dao

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