Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
dung sai » dung tai, dung va, dung dat
danh vai » danh sai, danh va, doanh van
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va
nang ma » tang ma, sang ma, nang cao
xuc va » duc va, tuc va, luc va
ma hoi » mai hoi, xa hoi, ma hoa
cua te » cua tu

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 ma hoi. ((hieu ve) OR (hieu van)) cam xuc va ((danh vai) or (dung sai)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ma hoi. ((hieu ve) OR (hieu van)) cam xuc va ((danh vai) OR (dung sai)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ma hoi. ((hieu ve) OR (hieu van)) cam xuc va ((danh vai) or (dung sai)) cua te".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ma hoi. ((hieu ve) OR (hieu van)) cam xuc va ((danh vai) or (dung sai)) cua te*.