Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh va, hanh tai
phan duc » pham duc, phan tu, phan dau
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
ly anh » le anh
ty anh » thuy anh
cua su » qua su

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 ((ty anh) OR (ly anh)) xa hoi. hieu van ((phan duc) or (cham soc)) va hanh vai cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty anh) OR (ly anh)) xa hoi. hieu van ((phan duc) OR (cham soc)) va hanh vai cua su.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty anh) OR (ly anh)) xa hoi. hieu van ((phan duc) or (cham soc)) va hanh vai cua su".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty anh) OR (ly anh)) xa hoi. hieu van ((phan duc) or (cham soc)) va hanh vai cua su*.