Perhaps you should try some spelling variations:
sach tham » sach nha
su triet » su viet, su tien, ve triet
dan lam » van lam, dan lap, dan nam
tu sach » thu sach, su sach, te sach
nang ma » tang ma, nang cao, mang may
sang ma » tang ma, sang tao, mang may
ve cai » va cai, ve cac, ve tai
va dan » ca dan, va dao, va dau
lam su » lai su, lam so, lam vu

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

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