Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh vai » thanh hai, thanh van, thanh tai
vu sach » vu bach, su sach, vu khach
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
cac duc » cao duc, cac dac, cac nuoc
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
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: vu sach ty nang ma hoi. hieu va ((cac duc) or (cac du)) ban thanh vai ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty nang ma hoi. hieu va ((cac duc) OR (cac du)) ban thanh vai ((cua tre) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ty nang ma hoi. hieu va ((cac duc) or (cac du)) ban thanh vai ((cua tre) OR (cuu tre))*".