Perhaps you should try some spelling variations:
bach tuoc » sach duoc, sach nuoc
hanh vai » hanh vi, hanh tai, hanh van
dua tren » dung tren
hanh va » hang va, hanh vi
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
tuoc va » thuoc va, nuoc va, duoc va
ve bach » ve cach, vu bach, vi bach
hieu ve » hieu va, hieu van
cuu tre » cua 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: tu sach ky nang x hoi. hieu ve bach tuoc va ((hanh vai) OR (hanh va)) ((dua tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu ve bach tuoc va ((hanh vai) OR (hanh va)) ((dua tren) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x hoi. hieu ve bach tuoc va ((hanh vai) OR (hanh va)) ((dua tren) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu ve bach tuoc va ((hanh vai) OR (hanh va)) ((dua tren) or (cuu tre))*.