Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
thanh vai » thanh van, thanh tai, thanh oai
nam thuc » nam thuoc, am thuc, nam thu
thuc tat » thuc vat, thuc tap, thuc tai
hieu van » hieu va, thien van, lieu va
tu cach » tu cac
su sach » so sach, vu sach
cuu tre » cua tre, cau tren, cau treo
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 cach) or (su sach)) ky nang x hoi. hieu van nam thuc tat ((thanh vai) OR (thanh hai)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (su sach)) ky nang x hoi. hieu van nam thuc tat ((thanh vai) OR (thanh hai)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (su sach)) ky nang x hoi. hieu van nam thuc tat ((thanh vai) OR (thanh hai)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (su sach)) ky nang x hoi. hieu van nam thuc tat ((thanh vai) OR (thanh hai)) cuu tre*.