Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
ban thanh » ban hanh, ban hang
tu sach » thu sach, su sach, tu cach
duc ban » duc tan, duc van, dua ban
ve cham » va cham, ve chat, vu cham
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
te sach » toc sach
ma hoi » mai hoi, xa hoi, ma hoa
ve cam » ve cac, va cam, ve cai

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 ((ve cam) OR (ve cham)) duc ban thanh dai 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 ((ve cam) OR (ve cham)) duc ban thanh dai 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 ((ve cam) OR (ve cham)) duc ban thanh dai cua tre*".