Perhaps you should try some spelling variations:
vao triet » va triet, mao triet, va trien
toc sach » hoc sach, doc sach, thuoc sach
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
xuc van » luc van, vuc van, xuc ban
duc van » duc va, duc tan, duc manh
hanh de » hanh ve, hanh kem
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
de vao » de dao, di vao, de tao

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

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