Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
tu sach » thu sach, su sach, te sach
vai cuu » vai cua
sach tu » sach thu, cach tu, sach ty
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
tu nang » tru nang, tu nong, tu nano
cuu tre » cua tre, cau tren, cau treo
ve cac » va cac, vien cac
luc va » tuc va, loc va
ma hoi » xa hoi, ma hoa, me hoi

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 nang ((ma hoi) OR (mai hoi)). hieu ve cac ((luc va) or (duc va)) hanh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu nang ((ma hoi) OR (mai hoi)). hieu ve cac ((luc va) OR (duc va)) hanh vai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tu nang ((ma hoi) OR (mai hoi)). hieu ve cac ((luc va) or (duc va)) hanh vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach tu nang ((ma hoi) OR (mai hoi)). hieu ve cac ((luc va) or (duc va)) hanh vai cuu tre*.