Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
van hanh » van thanh, ban hanh, van anh
thu san » thuy san, thu ban, phu san
cac loc » cac lop, cac toc, cac hoc
hieu va » lieu va, hieu qua
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang
cua tre » cua te, cuu tre, cua triet
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: thu san ((ky lang) or (ky dang)) xa hoi. hieu va cac loc ((van hanh) or (va thanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu san ((ky lang) OR (ky dang)) xa hoi. hieu va cac loc ((van hanh) OR (va thanh)) vi cua tre.
• Adding a wildcard symbol may retrieve word variants: thu san ((ky lang) or (ky dang)) xa hoi. hieu va cac loc ((van hanh) or (va thanh)) vi cua tre*.