Perhaps you should try some spelling variations:
kham chua » kham pha
day nhanh » day thanh, duy nhanh, dac nhan
pham chuc » pham duc, pham huu, pham huy
day hanh » day thanh, dao hanh, day manh
vu sach » vu bach, su sach, vu khach
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
nang o » nang co, nang ho, nang ro
le cua » ly cua
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 chuc) or (kham chua)) ((day hanh) or (day nhanh)) le cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang o hoi. hieu ve ((pham chuc) OR (kham chua)) ((day hanh) OR (day nhanh)) le cua tre.
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang o hoi. hieu ve ((pham chuc) or (kham chua)) ((day hanh) or (day nhanh)) le cua tre*.