Perhaps you should try some spelling variations:
tinh ninh » ninh binh
tinh vinh » tinh binh, tinh hinh, tinh sinh
thu sach » tu sach, thuat sach, thuoc sach
nam truc » nam truoc, nam thuc, nam trung
dieu ly » dieu ky, dien ly, lieu ly
sach ty » sach y, sach tu, sach thu
truc va » thuc va, thuc vat, trung va
cuu tre » cua tre, cau tren, cau treo

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 x) or (nang x)) hoi. dieu ly nam truc va ((tinh vinh) OR (tinh ninh)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty ((xang x) OR (nang x)) hoi. dieu ly nam truc va ((tinh vinh) OR (tinh ninh)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty ((xang x) or (nang x)) hoi. dieu ly nam truc va ((tinh vinh) OR (tinh ninh)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ty ((xang x) or (nang x)) hoi. dieu ly nam truc va ((tinh vinh) OR (tinh ninh)) cuu tre*.