Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
vuc nang » cuc nang, vu nang, chuc nang
te sach » toc sach
xuc van » duc van, luc van, vuc van
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao
v nang » va nang, vu nang, van nang
di cua » dai cua, doi cua, do cua
de cua » le cua, te cua, dieu cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((v nang) or (vuc nang)) xa hoi. hieu va cam xuc van hanh ((di cua) OR (de cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((v nang) OR (vuc nang)) xa hoi. hieu va cam xuc van hanh ((di cua) OR (de cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((v nang) or (vuc nang)) xa hoi. hieu va cam xuc van hanh ((di cua) OR (de cua)) te".
• Adding a wildcard symbol may retrieve word variants: te sach ((v nang) or (vuc nang)) xa hoi. hieu va cam xuc van hanh ((di cua) OR (de cua)) te*.