Perhaps you should try some spelling variations:
xang mai » lang mai, sang mai, hoang mai
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
sach ty » sach tu, sach thu, xach tay
mai hoi » mai khoi, dai hoi, lai hoi
van cam » van nam, van lam, van cau
cam tuc » cam xuc, cam tu, nam thuc
tuc van » thuc van, truc van, tuc va
hanh va » hang va, hanh vi
va hoc » van 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) or (sach y)) xang mai hoi. hieu van cam tuc van hanh va hoc hien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo ((sach ty) OR (sach y)) xang mai hoi. hieu van cam tuc van hanh va hoc hien.
• Adding a wildcard symbol may retrieve word variants: bo ((sach ty) or (sach y)) xang mai hoi. hieu van cam tuc van hanh va hoc hien*.