Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh lai » hanh lam, hanh tai, thanh lap
tu sach » thu sach, su sach, te sach
tu lang » tu lanh, xu lang, tu quang
cu lang » cua lang, xu lang, chi lang
van cam » van nam, van lam, van cau
duc van » duc va, duc manh, duc phan
lai cua » dai cua, hai cua, lai chau
cua tre » cua te, cuu tre, cua triet

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 ((tu lang) OR (cu lang)) xa hoi. hieu van cam ((duc van) or (duc tan)) hanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((tu lang) OR (cu lang)) xa hoi. hieu van cam ((duc van) OR (duc tan)) hanh lai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((tu lang) OR (cu lang)) xa hoi. hieu van cam ((duc van) or (duc tan)) hanh lai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((tu lang) OR (cu lang)) xa hoi. hieu van cam ((duc van) or (duc tan)) hanh lai cua tre*.