Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
va tinh » may tinh
ky dang » ky nang
ky danh » ky anh
hieu va » lieu va, hieu qua
cam loc » cam lo
tinh vi » trinh vi, tinh voi, tinh va
va cam » va cham, va cac, va cao
loc va » hoc va, luc va
ha hoi » hoa hoi, ha noi, xa hoi
cua tu » cua tuc, cua su, cua cu

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 ((ky dang) or (ky danh)) ha hoi. hieu va cam loc va tinh vi ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((ky dang) OR (ky danh)) ha hoi. hieu va cam loc va tinh vi ((cua te) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: so sach ((ky dang) or (ky danh)) ha hoi. hieu va cam loc va tinh vi ((cua te) or (cua tu))*.