Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
nam thucc » nam thuoc, am thuc, nam thu
nam thuc » nam thuoc, am thuc, nam thu
danh vai » danh sai, danh va, doanh van
hieu van » hieu va, thien van, lieu va
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
tu sach » thu sach, su sach, te sach
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, o hoi, x ho

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 (thuat sach)) ky nang x hoi. hieu van ((nam thucc) or (nam thuc)) va danh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat sach)) ky nang x hoi. hieu van ((nam thucc) OR (nam thuc)) va danh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuat sach)) ky nang x hoi. hieu van ((nam thucc) or (nam thuc)) va danh vai cua tre*.