Perhaps you should try some spelling variations:
danh vai » danh sai, danh va, doanh van
vu sach » vu bach, su sach, vu khach
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
va danh » va dinh, va dan, va hanh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (do sanh)) ky ((nang x) or (nang ma)) hoi. hieu va cam duc va danh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (do sanh)) ky ((nang x) OR (nang ma)) hoi. hieu va cam duc va danh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (do sanh)) ky ((nang x) or (nang ma)) hoi. hieu va cam duc va danh vai cua tre*.