Perhaps you should try some spelling variations:
dan hanh » dang hanh, dan khanh, dan thanh
thuc dan » thuc hanh, hoc dan, thuc vat
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
va cai » va cac, va bai, va dai
ve cac » va cac, vien cac
ve cam » ve cham, va cam, ve cai
di cua » dai cua, doi cua, de cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang x hoi. hieu ((((ve cam) or (va cai))) or (ve cac)) thuc dan hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu ((((ve cam) OR (va cai))) OR (ve cac)) thuc dan hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu ((((ve cam) or (va cai))) or (ve cac)) thuc dan hanh di cua tre*.