Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu va » lieu va, hieu qua
manh le » thanh le
duc van » duc va, duc tan, duc manh
sach ky » sac ky, sach y, sach ty
hieu ve » hieu van
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
anh le » oanh le, anh ve, thanh le
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 sach ky tang xa hoi. ((hieu ve) or (hieu va)) pham duc van ((anh le) OR (manh le)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky tang xa hoi. ((hieu ve) OR (hieu va)) pham duc van ((anh le) OR (manh le)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky tang xa hoi. ((hieu ve) or (hieu va)) pham duc van ((anh le) OR (manh le)) cua te".
• Adding a wildcard symbol may retrieve word variants: toc sach ky tang xa hoi. ((hieu ve) or (hieu va)) pham duc van ((anh le) OR (manh le)) cua te*.