Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
nam truc » nam truoc, nam thuc, nam trung
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
vai cuu » vai cua
xa hanh » xa thanh, xa khanh, va hanh
truc xa » tuc xa, truc va, truoc xay
cuu tre » cua tre, cau tren, cau treo
nang ma » sang ma, nang cao
tang ma » tang van

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 y ((((nang ma) OR (mang may))) or (tang ma)) hoi. hieu van nam truc xa hanh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((((nang ma) OR (mang may))) OR (tang ma)) hoi. hieu van nam truc xa hanh vai cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((((nang ma) OR (mang may))) or (tang ma)) hoi. hieu van nam truc xa hanh vai cuu tre*".