Perhaps you should try some spelling variations:
loai tren » la tren, thai tren
thu sach » tu sach, thuat sach, thuoc sach
cham xuc » cam xuc, chat xuc, cham soc
van hanh » van thanh, ban hanh, van anh
ky danh » ky anh, ky dang
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
xuc van » duc van, luc van, vuc van
cu tren » tu tren, dua tren
y danh » ly danh, 1 danh, 2 danh

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((y danh) or (ky danh)) xa hoi. hieu vu cham xuc van hanh vi ((cu tren) or (loai tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((y danh) OR (ky danh)) xa hoi. hieu vu cham xuc van hanh vi ((cu tren) OR (loai tren)).
• Adding a wildcard symbol may retrieve word variants: thu sach ((y danh) or (ky danh)) xa hoi. hieu vu cham xuc van hanh vi ((cu tren) or (loai tren))*.