Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
chua tre » chua tri, chua trieu, cho tre
thanh va » thanh van, hanh va, thanh ha
van bac » van ban, van bao, van hac
xuc ban » duc ban, cuc ban, quoc ban
tu sach » thu sach, su sach, tu cach
nang ma » tang ma, sang ma, nang cao
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa

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) or (te sach)) ky nang ma hoi. hieu van bac xuc ban thanh va ((chua tre) OR (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky nang ma hoi. hieu van bac xuc ban thanh va ((chua tre) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky nang ma hoi. hieu van bac xuc ban thanh va ((chua tre) OR (cua tre))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky nang ma hoi. hieu van bac xuc ban thanh va ((chua tre) OR (cua tre))*.