Perhaps you should try some spelling variations:
thien van » thi van
ban hanh » ban hang
hanh vai » hanh vi, hanh va, hanh tai
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nam dua » nam da, nam mua, nam qua
vai cuu » vai cua
cuu tre » cua tre, cau tren, cau treo

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 ky nang ((xa hoi) or (ma hoa)). thien van ((nam dua) or (nam cua)) ban hanh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((xa hoi) OR (ma hoa)). thien van ((nam dua) OR (nam cua)) ban hanh vai cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((xa hoi) or (ma hoa)). thien van ((nam dua) or (nam cua)) ban hanh vai cuu tre*.