Perhaps you should try some spelling variations:
su sach » vu sach
so sach » so sanh, bo sach, co sach
hieu ve » hieu va, hieu van
cac bac » cac bai, cac ban, cac cach
ha tinh » va tinh, may tinh
tinh vi » trinh vi, tinh voi, tinh va
y nang » ky nang, ly nang, v nang
ve cac » va cac, vien cac
x hoi » xa hoi, o hoi, x ho
vi va » vi van, vai va, vu 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) or (so sach)) y nang x hoi. hieu ve cac bac ha tinh vi va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) y nang x hoi. hieu ve cac bac ha tinh vi va thiet.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) y nang x hoi. hieu ve cac bac ha tinh vi va thiet*.