Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hanh cua » manh cua, hang cua, hanh sua
va hanh » van hanh, va thanh, va danh
cam loc » cam lo
hieu va » lieu va, hieu qua
su sach » so sach
hieu ve » hieu van
nang xa » nang x, lang xa, nang ma
vu sach » vu bach, vu khach
loc va » hoc va, luc va
cua va » cua vat, chua va, cua van

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