Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
thuc tat » thuc vat, thuc tap, thuc tai
tu cach » tu cac
su sach » so sach, vu sach
cuu tre » cua tre, cau tren, cau treo
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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 o hoi. hieu van nam thuc tat ((thanh vai) or (thanh san)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (su sach)) ky nang o hoi. hieu van nam thuc tat ((thanh vai) OR (thanh san)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (su sach)) ky nang o hoi. hieu van nam thuc tat ((thanh vai) or (thanh san)) cuu tre*.