Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hanh lai » hanh lam, hanh tai, thanh lap
va hanh » van hanh, va thanh, va danh
hac duc » hoc duc, ha duc, thach duc
hieu va » lieu va, hieu qua
tu sach » thu sach, te sach, tu cach
nang xa » lang xa, nang ma, mang xa
su sach » so sach, vu sach
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) OR (su sach)) ty ((nang xa) or (nang x)) hoi. hieu va hac duc va hanh lai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ty ((nang xa) OR (nang x)) hoi. hieu va hac duc va hanh lai su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ty ((nang xa) or (nang x)) hoi. hieu va hac duc va hanh lai su triet*".