Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
ban thanh » ban hanh, ban hang
nam thuoc » nam thuc, nam thu, nha thuoc
thuoc ban » thuoc tan, thuoc dang, thu ban
hoc sach » hoc sinh, hoc cac, hoc anh
toc sac » toc sach, toc san, doc sach
cua tre » cuu tre, cua triet, dua tren
nang ma » tang ma, sang ma, nang cao
va nam » van nam, ha nam, va nay
ma hoi » mai hoi, xa hoi, ma hoa
cua te » cua tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sac) OR (hoc sach)) ky nang ma hoi. lieu va nam thuoc ban thanh doi ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sac) OR (hoc sach)) ky nang ma hoi. lieu va nam thuoc ban thanh doi ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sac) OR (hoc sach)) ky nang ma hoi. lieu va nam thuoc ban thanh doi ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: ((toc sac) OR (hoc sach)) ky nang ma hoi. lieu va nam thuoc ban thanh doi ((cua tre) or (cua te))*.