Perhaps you should try some spelling variations:
toan thanh » tran thanh, hoan thanh, toan thang
thanh tai » thanh hai, thanh toan, doanh tai
duc toan » duc tan, duc ton, duc hoan
dua tren » dung tren
su sach » so sach, vu sach
vu nang » vuc nang, va nang, vu dang
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
ve cac » va cac, vien cac
v nang » va nang, van nang, voi nang
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((v nang) OR (vu nang)) x hoi. hieu ve cac duc toan thanh tai ((dua tren) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((v nang) OR (vu nang)) x hoi. hieu ve cac duc toan thanh tai ((dua tren) OR (cua te))*".