Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
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 » su sach, te sach, tu cach
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
tang ma » mang may, tang van
nang ma » sang ma, nang cao, mang may

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) OR (thu sach)) y ((nang ma) 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) OR (thu sach)) y ((nang ma) 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) OR (thu sach)) y ((nang ma) or (tang ma)) hoi. hieu van nam truc xa hanh vai cuu tre*".