Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
luoc gia » quoc gia, luc gia, luong gia
thanh ve » thanh va, thanh vien, thanh van
cau tren » cu tren, dau tren, ca tren
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van
hieu va » lieu va, hieu qua
hanh ve » hanh vi, hanh va, hanh kem
y nang » ky nang, ly nang, v nang

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 y nang xa hoi. ((hieu ve) or (hieu va)) tom luoc gia ((thanh ve) or (hanh ve)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang xa hoi. ((hieu ve) OR (hieu va)) tom luoc gia ((thanh ve) OR (hanh ve)) cau tren.
• Adding a wildcard symbol may retrieve word variants: toc sach y nang xa hoi. ((hieu ve) or (hieu va)) tom luoc gia ((thanh ve) or (hanh ve)) cau tren*.