Perhaps you should try some spelling variations:
va hanh » van hanh, va thanh, va danh
so sach » so sanh, bo sach, co sach
nang ma » tang ma, sang ma, nang cao
vu sach » vu bach, su sach, vu khach
hieu va » lieu va, hieu qua
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va
vai su » va su, van su, tai su

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) or (vu sach)) ky nang ma hoi. hieu va cam xuc va hanh ((vai su) OR (lai su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (vu sach)) ky nang ma hoi. hieu va cam xuc va hanh ((vai su) OR (lai su)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (vu sach)) ky nang ma hoi. hieu va cam xuc va hanh ((vai su) OR (lai su)) triet".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (vu sach)) ky nang ma hoi. hieu va cam xuc va hanh ((vai su) OR (lai su)) triet*.