Perhaps you should try some spelling variations:
day thanh » dao thanh, dat thanh, da thanh
dao hanh » dao thanh, dang hanh, ban hanh
vu sach » vu bach, su sach, vu khach
cuu tre » cua tre, cau tren, cau treo
hieu va » lieu va, hieu qua
nang o » nang co, nang ho, nang ro
di cuu » di cau, di cua, dinh cuu
o hoc » co hoc, mo hoc, so hoc
va am » va lam, va cam

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 (vay khach)) ky nang o hoc. hieu va am thuc ((dao hanh) or (day thanh)) di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vay khach)) ky nang o hoc. hieu va am thuc ((dao hanh) OR (day thanh)) di cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (vay khach)) ky nang o hoc. hieu va am thuc ((dao hanh) or (day thanh)) di cuu tre*.