Perhaps you should try some spelling variations:
lam truoc » lam thuoc, nam truoc, lam truong
hieu van » hieu va, thien van, lieu va
truoc va » truc va, thuoc va, truong va
dai tren » dat tren, dau tren, dan tren
su sach » vu sach
so sach » so sanh, bo sach, co sach
te sach » toc sach
cao hoi » cau hoi, co hoi, cao hoc
van lam » van nam
va hanh » van hanh, va thanh, va danh
vi dai » si dai, li dai, vien dai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((((su sach) or (so sach))) or (te sach)) ky nang cao hoi. hieu van lam truoc va hanh vi dai tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((su sach) OR (so sach))) OR (te sach)) ky nang cao hoi. hieu van lam truoc va hanh vi dai tren.
• Adding a wildcard symbol may retrieve word variants: ((((su sach) or (so sach))) or (te sach)) ky nang cao hoi. hieu van lam truoc va hanh vi dai tren*.