Perhaps you should try some spelling variations:
thien van » thi van
thu sach » tu sach, thuat sach, thuoc sach
hac nuoc » cac nuoc, phap nuoc, nhat nuoc
nang tri » nang tai, lang tri, nang thi
sang tai » hang tai, sang tao, tang tai
sach ky » sac ky, sach y, sach ty
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: thu sach ky nang x hoi. thien van ((hac nuoc) OR (hoc nuoc)) va ((nang tri) or (sang tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang x hoi. thien van ((hac nuoc) OR (hoc nuoc)) va ((nang tri) OR (sang tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang x hoi. thien van ((hac nuoc) OR (hoc nuoc)) va ((nang tri) or (sang tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x hoi. thien van ((hac nuoc) OR (hoc nuoc)) va ((nang tri) or (sang tai)) cua tre*.