Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
hoc sach » hoc sinh, hoc cac, hoc anh
thanh ca » thanh cha, thanh cac, thanh ha
cam duc » cam xuc, cao duc, pham duc
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu van
sach ky » sac ky, sach y, sach ty
duc van » duc va, duc tan, duc manh
hieu va » lieu va, hieu qua
ca cua » co cua
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: hoc sach ky ((nang xa) OR (nang ma)) hoi. ((hieu ve) or (hieu va)) cam duc van thanh ca cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky ((nang xa) OR (nang ma)) hoi. ((hieu ve) OR (hieu va)) cam duc van thanh ca cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ky ((nang xa) OR (nang ma)) hoi. ((hieu ve) or (hieu va)) cam duc van thanh ca cua te".
• Adding a wildcard symbol may retrieve word variants: hoc sach ky ((nang xa) OR (nang ma)) hoi. ((hieu ve) or (hieu va)) cam duc van thanh ca cua te*.