Perhaps you should try some spelling variations:
day nhanh » day thanh, duy nhanh, dac nhan
pham thuc » phap thuc, pham chuc, nham thuc
day hanh » day thanh, dao hanh, day manh
van manh » van minh, van anh, van hanh
sach ky » sac ky, sach y, sach ty
vu sach » vu bach, su sach, vu khach
ve pham » vi pham, v pham, ve phan
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
nang o » nang co, nang ho, nang ro
di cuu » di cau, di cua, dinh cuu
o hoi » co hoi, o hoc, o hai

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 o hoi. hieu ve pham thuc ((((day hanh) or (van manh))) or (day nhanh)) di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang o hoi. hieu ve pham thuc ((((day hanh) OR (van manh))) OR (day nhanh)) di cuu tre.
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang o hoi. hieu ve pham thuc ((((day hanh) or (van manh))) or (day nhanh)) di cuu tre*.