Perhaps you should try some spelling variations:
duoc tren » nuoc tren, thuoc tren, dung tren
thu sach » tu sach, thuat sach, thuoc sach
lam duoc » nam duoc, luat duoc, lam thuoc
dinh thi » dinh tri
duc tien » duc thien, luc tieng, thuc tien
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
duoc va » nuoc va, duc va, duoc ma
va dinh » van dinh, va kinh, va tinh
va lam » van lam, va lap

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty xang xa hoi. lieu va lam duoc va dinh thi ((duoc tren) or (duc tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty xang xa hoi. lieu va lam duoc va dinh thi ((duoc tren) OR (duc tien)).
• Adding a wildcard symbol may retrieve word variants: thu sach ty xang xa hoi. lieu va lam duoc va dinh thi ((duoc tren) or (duc tien))*.