Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
nam thuc » nam thuoc, am thuc, nam thu
toc sach » hoc sach, doc sach, thuoc sach
hanh vai » hanh vi, hanh va, hanh tai
hieu van » hieu va, thien van, lieu va
vai cuu » vai cua
va hanh » van hanh, va thanh, va danh
nam xua » nam cua, nam mua, nam qua
nang xa » nang x, lang xa, nang ma
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: ((thu sach) or (toc sach)) ky nang xa hoi. hieu van ((nam xua) or (nam thuc)) va hanh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (toc sach)) ky nang xa hoi. hieu van ((nam xua) OR (nam thuc)) va hanh vai cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (toc sach)) ky nang xa hoi. hieu van ((nam xua) or (nam thuc)) va hanh vai cuu tre*.