Perhaps you should try some spelling variations:
xang mai » lang mai, sang mai, hoang mai
bo sach » co sach, hoc sach
sach ty » sach y, sach tu, sach thu
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
cam tuc » cam tu, nam thuc, dam thuc
va hanh » van hanh, va thanh, va danh
vi hoc » li hoc, va hoc
hien » bien, vien, tien

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

• Performing a fuzzy search may retrieve terms with similar spellings: bo sach ty xang mai hoi. hieu ve ((cam tuc) OR (cam xuc)) va hanh vi hoc hien~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sach ty xang mai hoi. hieu ve ((cam tuc) OR (cam xuc)) va hanh vi hoc hien".
• Adding a wildcard symbol may retrieve word variants: bo sach ty xang mai hoi. hieu ve ((cam tuc) OR (cam xuc)) va hanh vi hoc hien*.