Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
vao triet » va triet, mao triet, va trien
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
xuc van » duc van, luc van, xuc ban
vuc van » duc van, luc van, thuc van
hanh di » hanh vi, hanh de, hang di
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang

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

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