Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
nam truc » nam truoc, nam thuc, nam trung
hanh vai » hanh vi, hanh va, hanh tai
nang ma » tang ma, sang ma, nang cao
truc xa » tuc xa, truc va, truoc xay
xa hanh » xa thanh, xa khanh, va hanh
vai cuu » vai cua
cuu tre » cua tre, cau tren, cau treo
ma hoi » mai hoi, xa hoi, ma hoa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) OR (toc sach)) ky nang ma hoi. hieu van nam truc xa hanh vai cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ky nang ma hoi. hieu van nam truc xa hanh vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ky nang ma hoi. hieu van nam truc xa hanh vai cuu tre*.