Perhaps you should try some spelling variations:
su triet » su tien, ve triet
hanh lai » hanh lam, hanh tai, thanh lap
tu sach » thu sach, su sach, te sach
va hanh » van hanh, va thanh, va danh
hac duc » hoc duc, ha duc, thach duc
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
nang xa » lang xa, nang ma, mang xa
su viet » so viet
va hac » van hac, va khac, va cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty ((nang xa) or (nang x)) hoi. hieu va hac duc va hanh lai ((su triet) OR (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang xa) OR (nang x)) hoi. hieu va hac duc va hanh lai ((su triet) OR (su viet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((nang xa) or (nang x)) hoi. hieu va hac duc va hanh lai ((su triet) OR (su viet))*".