Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
xuc va » duc va, tuc va, luc va
vi cu » vi xu, vi du
vi su » va su, ki su, oi su
ve su » va su

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