Perhaps you should try some spelling variations:
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
va hanh » van hanh, va thanh, va danh
ve cham » va cham, ve chat, vu cham
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
ve cam » ve cac, va cam, ve cai
xuc va » duc va, tuc va, luc va
lam va » nam va, lam ha, am va
dam va » dam van, nam va, dam ha
thiet » thieu

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