Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
tay thai » lay thai, toc thai, y thai
ky dang » ky nang, ky danh
va danh » va dinh, va dan, va hanh
cac hoc » cach hoc, cac hop, bac hoc
hieu va » lieu va, hieu qua
tay hoi » tay ho, tao hoi
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: tu cac ky dang ((tay hoi) or (tay thai)). hieu va cac hoc ((van hanh) or (va danh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky dang ((tay hoi) OR (tay thai)). hieu va cac hoc ((van hanh) OR (va danh)) vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu cac ky dang ((tay hoi) or (tay thai)). hieu va cac hoc ((van hanh) or (va danh)) vi cua tre*.