Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
sach thu » sach thue, sach thieu, sach tham
hieu van » hieu va, thien van, lieu va
tu triet » su triet, tu thiet, tu trien
sach ky » sac ky, sach y, sach ty
sach tu » cach tu, sach ty, sach uu
tang ma » mang may, tang van
van lam » van nam
lam duc » lam duoc, pham duc, nam duoc
duc gia » quoc gia

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ky) or (((sach tu) OR (sach thu)))) tang ma hoa. hieu van lam duc gia thanh tai tu triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (((sach tu) OR (sach thu)))) tang ma hoa. hieu van lam duc gia thanh tai tu triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) or (((sach tu) OR (sach thu)))) tang ma hoa. hieu van lam duc gia thanh tai tu triet".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (((sach tu) OR (sach thu)))) tang ma hoa. hieu van lam duc gia thanh tai tu triet*.