Perhaps you should try some spelling variations:
dung tren » dung trong, dung trung
vi dung » va dung, vi ung, vi dong
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
xuc va » duc va, tuc va, luc va
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (su sach)) ky nang x hoi. hieu ((ve cam) or (ve cac)) xuc va dan vi dung tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang x hoi. hieu ((ve cam) OR (ve cac)) xuc va dan vi dung tren.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang x hoi. hieu ((ve cam) or (ve cac)) xuc va dan vi dung tren*.