Perhaps you should try some spelling variations:
loai tren » la tren, thai tren
van hanh » van thanh, ban hanh, van anh
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky dinh » ky sinh, ky danh, ky kinh
dinh xa » dinh ba, dinh va, dinh xu
hieu vu » hieu va, hieu ve, hieu su
xuc van » duc van, luc van, vuc van
vu cam » vu cham, vu cao, va cam

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 dinh xa hoi. hieu vu cam xuc van hanh vi ((cau tren) OR (loai tren))~.
• Adding a wildcard symbol may retrieve word variants: tu sach ky dinh xa hoi. hieu vu cam xuc van hanh vi ((cau tren) or (loai tren))*.