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
van hanh » van thanh, ban hanh, van anh
thanh ve » hanh ve, thanh va, thanh vien
cua tre » cuu tre, cua triet, dua tren
sach tu » sach thu, cach tu, sach uu
sach ty » sach y, sach thu, xach tay
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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