Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
ve triet » su triet
thanh va » thanh van, hanh va, thanh ha
duc gia » quoc gia
cam duc » cam xuc, cao duc, pham duc
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
sang ma » tang ma, nang ma, sang tao
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam

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 ty ((nang xa) or (sang ma)) hoi. hieu ve cam duc gia thanh va ((ve triet) OR (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang xa) OR (sang ma)) hoi. hieu ve cam duc gia thanh va ((ve triet) OR (va trien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((nang xa) or (sang ma)) hoi. hieu ve cam duc gia thanh va ((ve triet) OR (va trien))".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang xa) or (sang ma)) hoi. hieu ve cam duc gia thanh va ((ve triet) OR (va trien))*.