Perhaps you should try some spelling variations:
trang tai » trang trai, tang tai, trang tri
tran tai » tran thi, toan tai, tran bai
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
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 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 ky ((nang xa) or (lang xa)) hoi. hieu va dau duc va ((tran tai) OR (trang tai)) cuc tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang xa) OR (lang xa)) hoi. hieu va dau duc va ((tran tai) OR (trang tai)) cuc tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang xa) or (lang xa)) hoi. hieu va dau duc va ((tran tai) OR (trang tai)) cuc tu".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang xa) or (lang xa)) hoi. hieu va dau duc va ((tran tai) OR (trang tai)) cuc tu*.