Perhaps you should try some spelling variations:
nang cai » nang cao, nang tai, nang cap
vu sach » vu bach, su sach, vu khach
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
cuc tre » duc tre, cua tre, cuu tre
cai hoi » cau hoi, dai hoi, cai hoa
y nang » ky nang, ly nang, v nang
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac

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 y nang cai hoi. hieu ((ve cam) OR (ve cac)) luc ((va hanh) or (va danh)) tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y nang cai hoi. hieu ((ve cam) OR (ve cac)) luc ((va hanh) OR (va danh)) tai cuc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach y nang cai hoi. hieu ((ve cam) OR (ve cac)) luc ((va hanh) or (va danh)) tai cuc tre".
• Adding a wildcard symbol may retrieve word variants: vu sach y nang cai hoi. hieu ((ve cam) OR (ve cac)) luc ((va hanh) or (va danh)) tai cuc tre*.