Perhaps you should try some spelling variations:
sach thien » sach thieu, sach tien, cach thien
thien van » thi van
cau treo » cau theo, cau tren, cau triet
hieu van » hieu va, lieu va, hieu ve
dua tren » dung tren
cuu tre » cua tre, cau tren
su sach » so sach, vu sach
va dinh » van dinh, va kinh, va tinh
thuc va » thuc vat, thuc dan, thuc day
xay hoi » xa hoi, tay hoi, cay phoi
dinh vi » dinh ve, dinh viet, dinh tri
van am » van nam, van lam, van dam

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach thien van xay hoi. hieu van am thuc va dinh vi ((dua tren) or (((cuu tre) or (cau treo))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thien van xay hoi. hieu van am thuc va dinh vi ((dua tren) OR (((cuu tre) OR (cau treo)))).
• Adding a wildcard symbol may retrieve word variants: su sach thien van xay hoi. hieu van am thuc va dinh vi ((dua tren) or (((cuu tre) or (cau treo))))*.