Perhaps you should try some spelling variations:
van thiet » va thiet, dan thiet, can thiet
van dinh » van minh, van dich, va dinh
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, dang xay, lang van
hieu ve » hieu van
sach ky » sac ky, sach y, sach kem
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
duc van » duc va, duc tan, duc manh
dinh su » dinh so, hinh su, dinh cu
su van » tu van, vu van

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach ky) or (sach ty)) lang xa hoi. ((hieu ve) or (hieu va)) cam duc van dinh su van thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sach ty)) lang xa hoi. ((hieu ve) OR (hieu va)) cam duc van dinh su van thiet.
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) or (sach ty)) lang xa hoi. ((hieu ve) or (hieu va)) cam duc van dinh su van thiet*.