Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cham sat » cham soc, khao sat, giam sat
cham mat » ham mat, nham mat, pham ma
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty lang » tay lang, ty xang, ty hang
lang xa » lang ha, dang xay, lang van
cuu tre » cua tre, cau tren, cau treo

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty lang xa hoi. lieu va ((cham sat) OR (cham mat)) van hanh vi ((cuu tre) OR (cua triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty lang xa hoi. lieu va ((cham sat) OR (cham mat)) van hanh vi ((cuu tre) or (cua triet))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ty lang xa hoi. lieu va ((cham sat) OR (cham mat)) van hanh vi ((cuu tre) or (cua triet))*.