Perhaps you should try some spelling variations:
phan duc » pham duc, phan tu, phan dau
hanh vai » hanh vi, hanh va, hanh tai
hieu van » thien van, lieu va, hieu ve
tu sach » thu sach, su sach, te sach
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
ang xa » lang xa, mang xa, dang xay
ty ang » ty xang, ty hang, ty anh
cua tu » cua tuc, cua su, cua cu

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