Perhaps you should try some spelling variations:
thang tai » tang tai, thanh tai, thong tai
hang tai » hang va, dung tai
tao khoi » tao hoi, thao khoa, lao khoa
nam thuc » nam thuoc, am thuc, nam tu
tu sach » thu sach, su sach, te sach
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
ky sang » ky nang, ky dang, ky tang

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 sang tao khoi. lieu va ((nam thuc) OR (nam thu)) xa ((hang tai) or (thang tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky sang tao khoi. lieu va ((nam thuc) OR (nam thu)) xa ((hang tai) OR (thang tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky sang tao khoi. lieu va ((nam thuc) OR (nam thu)) xa ((hang tai) or (thang tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky sang tao khoi. lieu va ((nam thuc) OR (nam thu)) xa ((hang tai) or (thang tai)) cua tre*.