Perhaps you should try some spelling variations:
thuc tuan » thu tuan, thuc huan, thuc luan
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
tu cach » tu cac
su sach » so sach, vu sach
ky lang » ky nang, ky tang, tay lang
ky dang » ky nang, ky danh
cua tre » cua te, cuu tre, cua triet
anh va » hanh va
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (su sach)) ((ky lang) OR (ky dang)) xa hoi. hieu van nam thuc tuan anh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (su sach)) ((ky lang) OR (ky dang)) xa hoi. hieu van nam thuc tuan anh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (su sach)) ((ky lang) OR (ky dang)) xa hoi. hieu van nam thuc tuan anh va cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (su sach)) ((ky lang) OR (ky dang)) xa hoi. hieu van nam thuc tuan anh va cua tre*.