Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
toc sach » hoc sach, doc sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
hieu ve » hieu va
cac duc » cac du, cao duc, cac dac
nang ma » tang ma, sang ma, nang cao
cua tre » cuu tre, cua triet, dua tren
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
cua te » cua tu

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 ma hoi. ((hieu ve) or (hieu van)) cac duc va thanh van ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang ma hoi. ((hieu ve) OR (hieu van)) cac duc va thanh van ((cua tre) OR (cua te))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang ma hoi. ((hieu ve) or (hieu van)) cac duc va thanh van ((cua tre) OR (cua te))*".