Perhaps you should try some spelling variations:
sach nuoc » sach duoc, cac nuoc, bach tuoc
hanh tai » thanh tai, hang tai, han tai
cau treo » cau tren, cau triet, cau trieu
cau theo » cau thi, cau tao
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
va sach » van sach, va cach, a sach
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
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 va sach nuoc va hanh tai ((cua tre) or (((cau treo) OR (cau theo))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu va sach nuoc va hanh tai ((cua tre) OR (((cau treo) OR (cau theo)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x hoi. hieu va sach nuoc va hanh tai ((cua tre) or (((cau treo) OR (cau theo))))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu va sach nuoc va hanh tai ((cua tre) or (((cau treo) OR (cau theo))))*.