Perhaps you should try some spelling variations:
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
cac khu » cac thu, cac khoi, cac kieu
khu may » chu may, chua may, phuc may
tinh vi » trinh vi, tinh voi, tinh va
ly van » le van, ly va, lo van
ve cac » va cac, vien cac
vi cua » vai cua, di cua
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 ((ly van) OR (ly von)) xa hoi. hieu ve cac khu may tinh vi cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ly van) OR (ly von)) xa hoi. hieu ve cac khu may tinh vi cua te".
• Adding a wildcard symbol may retrieve word variants: su sach ((ly van) OR (ly von)) xa hoi. hieu ve cac khu may tinh vi cua te*.