Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
vai cua » dai cua, hai cua, lai cua
dan vai » dan va, dan tai, dan vat
tu sach » thu sach, su sach, te sach
ky lang » ky dang, ky tang, tay lang
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
tuc va » thuc va, truc va, tuc xa
va dan » ca dan, va dao, va dau

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 ((ky lang) or (ky nang)) xa hoi. hieu ((ve cam) OR (ve cac)) tuc va dan vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky lang) OR (ky nang)) xa hoi. hieu ((ve cam) OR (ve cac)) tuc va dan vai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky lang) or (ky nang)) xa hoi. hieu ((ve cam) OR (ve cac)) tuc va dan vai cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky lang) or (ky nang)) xa hoi. hieu ((ve cam) OR (ve cac)) tuc va dan vai cua triet*.