Perhaps you should try some spelling variations:
dang xay » dang van, van xay
dan hanh » dang hanh, dan khanh, dan thanh
thu sach » tu sach, thuat sach, thuoc sach
thuc dan » thuc hanh, hoc dan, thuc vat
nam thuc » nam thuoc, am thuc, nam thu
cua tre » cua te, cuu tre, cua triet
hieu he » hieu ve, hiem he, hieu le
nang xa » nang x, lang xa, nang ma
he nam » ha nam, nghe nam
vi cua » vai cua, di cua
tu sac » tu sach, tu cac, tu san

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sac) or (thu sach)) ky ((nang xa) or (dang xay)) hoi. hieu he nam thuc dan hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (thu sach)) ky ((nang xa) OR (dang xay)) hoi. hieu he nam thuc dan hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sac) or (thu sach)) ky ((nang xa) or (dang xay)) hoi. hieu he nam thuc dan hanh vi cua tre*.