Perhaps you should try some spelling variations:
van nang » van quang, van ban, van dung
hanh vai » hanh vi, hanh va, hanh tai
tu sach » thu sach, su sach, te sach
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
cua te » cua tu
va cam » va cham, va cac, va cao
ve cai » va cai, ve cac, ve tai

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