Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh de » hanh ve, hanh kem
vu sach » vu bach, su sach, vu khach
ly vang » ly hang, ly van, ly quang
ly lang » ly hang, le lang, ly lanh
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao
de cua » le cua, te cua, dieu cua

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

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