Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thanh vai » thanh hai, thanh van, thanh oai
thanh tai » thanh hai, thanh toan, doanh tai
cua triet » cua viet, su triet, va triet
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
nang xa » lang xa, nang ma, mang xa
cac lo » cac lop, cac co, cac bo
lo va » lo van, lao va, ly va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ky ((nang xa) OR (nang x)) hoi. hieu va cac lo va ((thanh vai) or (thanh tai)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky ((nang xa) OR (nang x)) hoi. hieu va cac lo va ((thanh vai) OR (thanh tai)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky ((nang xa) OR (nang x)) hoi. hieu va cac lo va ((thanh vai) or (thanh tai)) cua triet".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky ((nang xa) OR (nang x)) hoi. hieu va cac lo va ((thanh vai) or (thanh tai)) cua triet*.