Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh di » hanh vi, hanh de, hang di
truc va » thuc va, trung va
hieu ve » hieu va, hieu van
su sach » so sach, vu sach
vu nang » vuc nang, va nang, vu dang
v nang » va nang, van nang, voi nang
di cua » dai cua, doi cua, de cua
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((v nang) OR (vu nang)) xa hoi. hieu ve cam ((truc va) or (thuc vat)) hanh di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((v nang) OR (vu nang)) xa hoi. hieu ve cam ((truc va) OR (thuc vat)) hanh di cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((v nang) OR (vu nang)) xa hoi. hieu ve cam ((truc va) or (thuc vat)) hanh di cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach ((v nang) OR (vu nang)) xa hoi. hieu ve cam ((truc va) or (thuc vat)) hanh di cua triet*.