Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thien van » thi van
hanh tai » thanh tai, hang tai, han tai
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
cau tuc » cau truc, cau luc, cau phuc
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
cau tu » dau tu, cau truc

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 lang xa hoi. thien van ((cau tuc) OR (cau tu)) va ((hanh tai) or (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky lang xa hoi. thien van ((cau tuc) OR (cau tu)) va ((hanh tai) OR (hanh vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky lang xa hoi. thien van ((cau tuc) OR (cau tu)) va ((hanh tai) or (hanh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky lang xa hoi. thien van ((cau tuc) OR (cau tu)) va ((hanh tai) or (hanh vi)) cua tre*.