Perhaps you should try some spelling variations:
co sach » bo sach, cuon sach, hoc sach
ky sang » ky nang, ky dang, ky tang
sang ma » tang ma, nang ma, sang tao
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
truc va » thuc va, thuc vat, trung va
vi cua » vai cua, di cua
luc va » duc va, loc va
tuc va » thuc va, tuc xa, duc va
ve cam » ve cham, ve cac, va cam
ma hai » ta hai, va hai, xa hai
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: co sach ky sang ma hai. hieu ve cam ((luc va) or (((tuc va) or (truc va)))) hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach ky sang ma hai. hieu ve cam ((luc va) OR (((tuc va) OR (truc va)))) hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: co sach ky sang ma hai. hieu ve cam ((luc va) or (((tuc va) or (truc va)))) hanh vi cua te*.