Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
tham xuc » tham nuoc, tham thuc, pham duc
nang cau » nang cao, nang dau, bang cau
thanh va » thanh van, hanh va, thanh ha
hang cau » hang dau, hang ca, nhung cau
va tham » van tham, va cham, va thanh
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
luu tre » luu tru, cuu tre, luy tre
xuc va » duc va, tuc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky ((nang cau) OR (hang cau)) hoi. hieu va tham xuc va ((thanh va) or (hanh vi)) luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky ((nang cau) OR (hang cau)) hoi. hieu va tham xuc va ((thanh va) OR (hanh vi)) luu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky ((nang cau) OR (hang cau)) hoi. hieu va tham xuc va ((thanh va) or (hanh vi)) luu tre*".