Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
thu sach » thuat sach, thuoc sach, thu hoach
bac dac » bac dai, ban dac, bac dan
cua tre » cuu tre, cua triet, dua tren
dac ban » cac ban, dac san, duc ban
tu sach » su sach, te sach, tu cach
van bac » van ban, van bao, van hac
nang co » nang cao, nang doc, nang noi
co hoi » co hoc, co loi
y nang » ky nang, ly nang, v nang
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: ((tu sach) OR (thu sach)) y nang co hoi. hieu van bac dac ban thanh dai ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y nang co hoi. hieu van bac dac ban thanh dai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) y nang co hoi. hieu van bac dac ban thanh dai ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) y nang co hoi. hieu van bac dac ban thanh dai ((cua tre) or (cua te))*.