Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
nang cau » nang cao, hang cau, nang dau
van hanh » van thanh, ban hanh, van anh
than cua » nhan cua, thai cua, ban cua
vu sach » vu bach, su sach
va nang » van nang, da nang, cam nang
va hanh » va thanh, va danh, ban hanh
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) OR (vu khach)) ky nang cau hoi. lieu va nang luc ((va hanh) or (van hanh)) than cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu khach)) ky nang cau hoi. lieu va nang luc ((va hanh) OR (van hanh)) than cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) OR (vu khach)) ky nang cau hoi. lieu va nang luc ((va hanh) or (van hanh)) than cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) OR (vu khach)) ky nang cau hoi. lieu va nang luc ((va hanh) or (van hanh)) than cua tre*.