Perhaps you should try some spelling variations:
vat triet » va triet, va trien, ve triet
van hanh » van thanh, ban hanh, van anh
hanh cua » manh cua, hang cua, hanh sua
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van
hieu va » lieu va, hieu qua
cam loc » cam lo
loc van » luoc van, hoc van, lo 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 ky nang xa hoi. ((hieu ve) or (hieu va)) cam loc van hanh cua vat triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. ((hieu ve) OR (hieu va)) cam loc van hanh cua vat triet.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. ((hieu ve) or (hieu va)) cam loc van hanh cua vat triet*.