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
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, dang xay, lang van
ty lang » tay lang, ty xang, ty hang
ve cac » va cac, vien cac
ve cau » ke cau, va cau, le cau

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 xa hoi. hieu ((ve cau) OR (ve cac)) 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 xa hoi. hieu ((ve cau) OR (ve cac)) 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 xa hoi. hieu ((ve cau) OR (ve cac)) cua ban dan vai ((dua tren) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ty lang xa hoi. hieu ((ve cau) OR (ve cac)) cua ban dan vai ((dua tren) or (cua triet))*.