Perhaps you should try some spelling variations:
thanh nghia » thanh nghi, thanh nga, thanh nha
thi nghiem » thuc nghiem
cac thanh » bac thanh, cach nhanh, ban thanh
nghiem ad » nghiem d, nghiem ban, nghiem lam
nghia so » nghia do, nghia o, nghia lon
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
so hoc » co hoc, mo hoc, so hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu cac thanh nghia so hoc ) or ( ((thu sach) OR (tu sach)) thi nghiem ad hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu cac thanh nghia so hoc ) OR ( ((thu sach) OR (tu sach)) thi nghiem ad hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tu cac thanh nghia so hoc ) or ( ((thu sach) OR (tu sach)) thi nghiem ad hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( tu cac thanh nghia so hoc ) or ( ((thu sach) OR (tu sach)) thi nghiem ad hoc ))*.