Perhaps you should try some spelling variations:
tay thai » lay thai, toc thai, y thai
ban hanh » ban hang
tay hoi » tay ho, tao hoi
hieu va » lieu va, hieu qua
cac hoc » cach hoc, cac hop, bac hoc
va danh » va dinh, va dan, va hanh
cuu tre » cua tre, cau tren, cau treo
vi cuu » vi luu, vinh cuu

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 nang ((tay hoi) or (tay thai)). hieu va cac hoc ((ban hanh) or (va danh)) vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky nang ((tay hoi) OR (tay thai)). hieu va cac hoc ((ban hanh) OR (va danh)) vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu cac ky nang ((tay hoi) or (tay thai)). hieu va cac hoc ((ban hanh) or (va danh)) vi cuu tre*.