Perhaps you should try some spelling variations:
dang thanh » dong thanh, dang hanh, hoang thanh
thuoc dang » thuoc dung, thuoc khang, thuc dan
hanh thuoc » thanh phuoc, hanh phuc, dang thuoc
thien van » thi van
thanh ve » hanh ve, thanh va, thanh vien
van hanh » van thanh, ban hanh, van anh
sach tu » sach thu, cach tu, sach uu
sach ty » sach y, sach thu, xach tay
cua tre » cua te, cuu tre, cua triet
ve cua » le cua, de cua, te cua
x hoi » xa hoi, o hoi, 5 hoi

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 tu) or (sach ty)) nang ((x hoi) OR (x ho)). thien van hanh thuoc dang thanh ve cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach tu) OR (sach ty)) nang ((x hoi) OR (x ho)). thien van hanh thuoc dang thanh ve cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach tu) or (sach ty)) nang ((x hoi) OR (x ho)). thien van hanh thuoc dang thanh ve cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach tu) or (sach ty)) nang ((x hoi) OR (x ho)). thien van hanh thuoc dang thanh ve cua tre*.