Perhaps you should try some spelling variations:
day hanh » day nhanh, day thanh, dao hanh
vu khach » vu khanh, vu khac, vay khach
thuc day » thuc dan, thuc vat
nam thuc » nam thuoc, am thuc, nam thu
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu van
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, ly nang, v nang
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: ((su sach) or (vu khach)) y nang ma hoi. ((hieu ve) or (hieu va)) nam thuc day hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu khach)) y nang ma hoi. ((hieu ve) OR (hieu va)) nam thuc day hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu khach)) y nang ma hoi. ((hieu ve) or (hieu va)) nam thuc day hanh vi cua tre*.