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