Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
kinh vi » dinh vi, kinh ve, kenh vi
ky dang » ky nang, ky danh
ky tang » ky nang, kho tang, ky trong
lap hai » lap tai, lap lai, lap hoat
hieu ve » hieu va, hieu van
cam loc » cam lo
va kinh » va tinh, qua kinh
cua tu » cua tuc, cua cu, cua te
ve cam » ve cham, ve cac, va cam
loc va » hoc va, luc va
cua su » qua su

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 tang)) lap hai. hieu ve cam loc va kinh vi ((cua tu) or (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((ky dang) OR (ky tang)) lap hai. hieu ve cam loc va kinh vi ((cua tu) OR (cua su)).
• Adding a wildcard symbol may retrieve word variants: so sach ((ky dang) or (ky tang)) lap hai. hieu ve cam loc va kinh vi ((cua tu) or (cua su))*.