Perhaps you should try some spelling variations:
phan mai » phan may, phan bai, phan hai
phan dai » phan dau, phan day, phan loai
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van
hieu va » lieu va, hieu qua
xuc va » duc va, tuc va, luc va
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 ky nang xa hoi. ((hieu ve) or (hieu va)) cam xuc va ((phan mai) OR (phan dai)) va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. ((hieu ve) OR (hieu va)) cam xuc va ((phan mai) OR (phan dai)) va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. ((hieu ve) or (hieu va)) cam xuc va ((phan mai) OR (phan dai)) va thiet".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. ((hieu ve) or (hieu va)) cam xuc va ((phan mai) OR (phan dai)) va thiet*.