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