Perhaps you should try some spelling variations:
dang thai » dang thi, dang hai, dang khai
bac nuoc » cac nuoc, bach tuoc, sach nuoc
van bac » van ban, van bao, van hac
cua tre » cuu tre, cua triet, dua tren
va dang » van dang, va nang, va lang
thi van » thi lan, thi hanh, thi nang
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, sach thu
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: thuoc ((sach ky) or (sach ty)) nang x hoi. thi van bac nuoc va dang thai ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc ((sach ky) OR (sach ty)) nang x hoi. thi van bac nuoc va dang thai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc ((sach ky) or (sach ty)) nang x hoi. thi van bac nuoc va dang thai ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: thuoc ((sach ky) or (sach ty)) nang x hoi. thi van bac nuoc va dang thai ((cua tre) OR (cua te))*.