Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
tang ma » mang may, tang van
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
luu tre » luu tru, cuu tre, luy tre
ve cam » ve cham, ve cac, va cam
xuc va » duc va, tuc va, luc va
vi luu » vi lua

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang x) OR (tang ma)) hoi. hieu ve cam xuc va hanh vi luu tre~.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang x) or (tang ma)) hoi. hieu ve cam xuc va hanh vi luu tre*.