Perhaps you should try some spelling variations:
kmay nang » ky nang, kha nang, may nong
van chat » cao chat
may nang » may nong, ky nang, cam nang
hieu van » hieu va, thien van, lieu va
chat luc » chat xuc, chat lua, nhan luc
va hanh » van hanh, va thanh, ban hanh
vai cuu » vai cua
va danh » va dinh, va dan, dia danh
tu sach » thu sach, su sach, te sach
cuu tre » cua tre, cau tren, cau treo

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 ((may nang) or (kmay nang)) xa hoi. hieu van chat luc ((va hanh) OR (va danh)) vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((may nang) OR (kmay nang)) xa hoi. hieu van chat luc ((va hanh) OR (va danh)) vai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((may nang) or (kmay nang)) xa hoi. hieu van chat luc ((va hanh) OR (va danh)) vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((may nang) or (kmay nang)) xa hoi. hieu van chat luc ((va hanh) OR (va danh)) vai cuu tre*.