Perhaps you should try some spelling variations:
vat thanh » dat thanh, gat thanh, tat thanh
hieu van » hieu va, thien van, lieu va
thanh ve » hanh ve, thanh va, thanh vien
truc vat » thuc vat, truc va, truc van
cua tre » cua te, cua triet, dua tren
van cau » van dau, van hau, van chat
tu sach » thu sach, su sach, tu cach
tang ha » lang ha, tang ma, trung ha
ky tang » ky nang, ky dang, kho tang
te sach » toc sach
cuu tre » cau tren, cau treo
ha hoi » hoa hoi, ha noi, xa hoi

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 (te sach)) ky tang ha hoi. hieu van cau truc vat thanh ve ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky tang ha hoi. hieu van cau truc vat thanh ve ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky tang ha hoi. hieu van cau truc vat thanh ve ((cua tre) or (cuu tre))*.