Perhaps you should try some spelling variations:
tan thanh » tran thanh, tang thanh, toan thanh
va triet » va thiet, va trien, ve triet
cham duc » pham duc, cham soc, phan duc
thanh va » thanh van, hanh va, thanh ha
thu sach » thuat sach, thuoc sach, thu hoach
tang van » dang van, hoang van, trong van
pham duy » pham duc
tu sach » su sach, te sach, tu cach
hieu ve » hieu va, hieu van
ky tang » ky nang, ky dang, kho tang
va va » va van, va vua, va vai

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 (thu sach)) ky tang van hoa. hieu ve ((cham duc) or (pham duy)) tan thanh va va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky tang van hoa. hieu ve ((cham duc) OR (pham duy)) tan thanh va va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ky tang van hoa. hieu ve ((cham duc) or (pham duy)) tan thanh va va triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ky tang van hoa. hieu ve ((cham duc) or (pham duy)) tan thanh va va triet*.