Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
va thanh » gia thanh, ban thanh, va tinh
nay thuc » nam thuc, cay thuc, day thuc
ho nang » thi nang, kha nang, cao nang
va hanh » van hanh, va danh, ban hanh
lo nang » ly nang, loai nang, cao nang
tu sach » thu sach, su sach, te sach
va nay » va ngay, va cay
x hoi » xa hoi, o hoi, x ho
di su » doi su, ki su, da su

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 ((lo nang) OR (ho nang)) x hoi. lieu va nay thuc ((va hanh) or (va thanh)) di su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((lo nang) OR (ho nang)) x hoi. lieu va nay thuc ((va hanh) OR (va thanh)) di su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((lo nang) OR (ho nang)) x hoi. lieu va nay thuc ((va hanh) or (va thanh)) di su triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((lo nang) OR (ho nang)) x hoi. lieu va nay thuc ((va hanh) or (va thanh)) di su triet*.