Perhaps you should try some spelling variations:
phan duc » pham duc, phan tu, phan dau
va hanh » van hanh, va thanh, va danh
ke phan » ve phan, kenh phan, ke thang
tu sach » thu sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
su sach » so sach, vu sach
hieu ke » hieu kem, chieu ke, hieu ky
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: ((tu sach) OR (su sach)) ty nang xa hoi. hieu ke phan duc va hanh ((vi su) or (ve su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ty nang xa hoi. hieu ke phan duc va hanh ((vi su) OR (ve su)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ty nang xa hoi. hieu ke phan duc va hanh ((vi su) or (ve su)) triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ty nang xa hoi. hieu ke phan duc va hanh ((vi su) or (ve su)) triet*.