Perhaps you should try some spelling variations:
nang cau » nang cao, hang cau, nang dau
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
va kinh » qua kinh
va tinh » may tinh
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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 ky nang cau hoi. hieu van pham duc ((va kinh) OR (va tinh)) vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang cau hoi. hieu van pham duc ((va kinh) OR (va tinh)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang cau hoi. hieu van pham duc ((va kinh) OR (va tinh)) vi cua tre*.