Perhaps you should try some spelling variations:
sach tham » sach nha
cau treo » cau theo, cau tren, cau triet
thanh ve » hanh ve, thanh va, thanh vien
hieu van » hieu va, thien van, lieu va
dang xay » dang van, van xay
xay hoi » xa hoi, tay hoi, cay phoi
sach ty » sach y, sach tu, sach thu
van cam » van nam, van lam, van cau
cam duc » cam xuc, cao duc, pham duc
duc gia » quoc gia
cuu tre » cua tre, cau tren

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ty) or (sach tham)) dang xay hoi. hieu van cam duc gia thanh ve ((cuu tre) OR (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sach tham)) dang xay hoi. hieu van cam duc gia thanh ve ((cuu tre) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) or (sach tham)) dang xay hoi. hieu van cam duc gia thanh ve ((cuu tre) OR (cau treo))".
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) or (sach tham)) dang xay hoi. hieu van cam duc gia thanh ve ((cuu tre) OR (cau treo))*.