Perhaps you should try some spelling variations:
nuoc van » nuoc va, nuoc san, luoc van
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
de cua » le cua, te cua, dieu cua
di cua » dai cua, doi cua, do cua
ve cac » va cac, vien cac
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, ly nang, v nang

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) y nang ma hoi. hieu ve cac nuoc van hanh ((di cua) OR (de cua)) tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) y nang ma hoi. hieu ve cac nuoc van hanh ((di cua) or (de cua)) tu~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) y nang ma hoi. hieu ve cac nuoc van hanh ((di cua) or (de cua)) tu*.