Perhaps you should try some spelling variations:
thanh than » thanh thanh, thanh thang, thanh toan
hieu van » hieu va, thien van, hieu ve
va thanh » gia thanh, ban thanh, va tinh
va triet » va thiet, ve triet, cua triet
va trien » va truyen, va thiet, va tuyen
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
bac tu » ban tu, tac tu, cac tu

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 lang xa hoi. ((hieu van) or (lieu va)) bac tu va thanh than ((va triet) OR (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang xa hoi. ((hieu van) OR (lieu va)) bac tu va thanh than ((va triet) OR (va trien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky lang xa hoi. ((hieu van) or (lieu va)) bac tu va thanh than ((va triet) OR (va trien))".
• Adding a wildcard symbol may retrieve word variants: su sach ky lang xa hoi. ((hieu van) or (lieu va)) bac tu va thanh than ((va triet) OR (va trien))*.