Perhaps you should try some spelling variations:
tran tai » trang tai, tran thi, toan tai
su sach » vu sach
so sach » so sanh, bo sach, co sach
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
dau duc » dao duc, dang duc, dau nuoc
va tran » va trang, va trac, ha tran
va dau » va dao
cuc tu » cuc du, luc tu, duc 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) OR (so sach)) ky ((nang xa) or (lang xa)) hoi. hieu va dau duc va tran tai cuc tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky ((nang xa) OR (lang xa)) hoi. hieu va dau duc va tran tai cuc tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) ky ((nang xa) or (lang xa)) hoi. hieu va dau duc va tran tai cuc tu".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) ky ((nang xa) or (lang xa)) hoi. hieu va dau duc va tran tai cuc tu*.