Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dua tren » dung tren
dan vai » dan va, dan tai, dan vat
ban dan » ban hang, ban hanh, ban quan
cau cua » cau qua, ca cua, cu cua
tu sach » thu sach, su sach, te sach
ty hang » ly hang, ty xang, thi hang
ty lang » tay lang, ty xang, tu lang
hieu ve » hieu va, hieu van
ve cau » ke cau, va cau, ve 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 ((ty lang) OR (ty hang)) xa hoi. hieu ve cau cua ban dan vai ((dua tren) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty lang) OR (ty hang)) xa hoi. hieu ve cau cua ban dan vai ((dua tren) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty lang) OR (ty hang)) xa hoi. hieu ve cau cua ban dan vai ((dua tren) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty lang) OR (ty hang)) xa hoi. hieu ve cau cua ban dan vai ((dua tren) or (cua triet))*.