Perhaps you should try some spelling variations:
sach thien » sach thieu, sach tien, cach thien
cau treo » cau theo, cau tren, cau triet
hieu van » hieu va, thien van, lieu va
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
cua tre » cua te, cuu tre, cua triet
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
dang xa » dang xay, dang ha, dang va
nam xua » nam cua, nam mua, nam qua
xua va » xuat va, vua va, sua va

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 ((dang xa) or (lang xa)) hoi. hieu van nam xua va thanh vi ((cua tre) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thien ((dang xa) OR (lang xa)) hoi. hieu van nam xua va thanh vi ((cua tre) OR (cau treo)).
• Adding a wildcard symbol may retrieve word variants: su sach thien ((dang xa) or (lang xa)) hoi. hieu van nam xua va thanh vi ((cua tre) or (cau treo))*.