Perhaps you should try some spelling variations:
xang mai » lang mai, sang mai, hoang mai
van hanh » van thanh, ban hanh, van anh
hoc bien » hoc hien, hoc vien, hoa bien
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
vi hoc » li hoc, va hoc

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)) van hanh vi hoc bien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ty xang mai hoi. hieu ve ((cam tuc) OR (cam xuc)) van hanh vi hoc bien.
• Adding a wildcard symbol may retrieve word variants: bo sach ty xang mai hoi. hieu ve ((cam tuc) or (cam xuc)) van hanh vi hoc bien*.