Perhaps you should try some spelling variations:
vinh cuu » dinh cuu, sinh cua, dinh cu
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
duc van » duc va, duc tan, duc manh
nang ho » nang hoc, nang co, tang ho
y nang » ky nang, ly nang, v nang
va cao » va cac, va co, va dao
va cam » va cham, va cac, va cai
ho hoi » hoc hoi, hoa hoi, hoi hoi
vi cuu » vi luu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang ho hoi. hieu ((va cam) OR (va cao)) duc van hanh ((vi cuu) or (vinh cuu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ho hoi. hieu ((va cam) OR (va cao)) duc van hanh ((vi cuu) OR (vinh cuu)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang ho hoi. hieu ((va cam) OR (va cao)) duc van hanh ((vi cuu) or (vinh cuu)) tre".
• Adding a wildcard symbol may retrieve word variants: su sach y nang ho hoi. hieu ((va cam) OR (va cao)) duc van hanh ((vi cuu) or (vinh cuu)) tre*.