Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
su sach » so sach, vu sach
ty nang » ky nang, ty hang, ly nang
hieu ve » hieu va, hieu van
luc van » luoc van, luu van, duc van
hanh va » hang va, hanh vi
ve cam » ve cham, ve cac, va cam
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) or (ty xang)) xa hoi. hieu ve cam ((luc van) or (duc tan)) hanh va va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty nang) OR (ty xang)) xa hoi. hieu ve cam ((luc van) OR (duc tan)) hanh va va trien.
• Adding a wildcard symbol may retrieve word variants: su sach ((ty nang) or (ty xang)) xa hoi. hieu ve cam ((luc van) or (duc tan)) hanh va va trien*.