Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu luc » hieu luat, hieu qua
luc chat » luc nhat, luu chat, muc chat
chat xuc » chat huu, cam xuc, chao xu
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
cua tre » cua te, cuu tre, dua tren

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 xang xa hoi. hieu luc chat xuc ((van hanh) or (ban hanh)) vi ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty xang xa hoi. hieu luc chat xuc ((van hanh) OR (ban hanh)) vi ((cua tre) OR (cua triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty xang xa hoi. hieu luc chat xuc ((van hanh) or (ban hanh)) vi ((cua tre) OR (cua triet))*".