Perhaps you should try some spelling variations:
hieu phan » phieu phan, lieu phan, hieu pham
vu khach » vu khanh, vu khac, vay khach
danh vai » danh sai, danh va, doanh van
phan cau » phan dau, phan cac, phan tu
su sach » so sach, vu sach
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
truc va » thuc va, thuc vat, trung va
cua tre » cua te, cuu tre, cua triet
sang ma » tang ma, sang tao, mang may
nang ma » tang 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: ((su sach) or (vu khach)) ky ((nang ma) or (sang ma)) hoi. hieu phan cau truc va danh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu khach)) ky ((nang ma) OR (sang ma)) hoi. hieu phan cau truc va danh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu khach)) ky ((nang ma) or (sang ma)) hoi. hieu phan cau truc va danh vai cua tre*.