Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
sach ty » sach y, sach tu, sach thu
hanh va » hang va, hanh vi
duc van » duc va, duc tan, duc manh
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
luc van » luoc van, luu van, vuc van
ve cam » ve cham, ve cac, va cam
luc va » duc va, tuc va, loc va
va va » va van, va vua, va vai

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