Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
cua triet » cua viet, su triet, va triet
chang xu » chang xue, chao xu, thong xu
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ban duc » ban duoc, van duc, ban dac
cua tre » cua te, cuu tre, dua tren
hang x » nang x, hoang xa, hang nxb

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty ((hang x) or (chang xu)) hoi. hieu van ban duc va thanh dai ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty ((hang x) OR (chang xu)) hoi. hieu van ban duc va thanh dai ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty ((hang x) or (chang xu)) hoi. hieu van ban duc va thanh dai ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: te sach ty ((hang x) or (chang xu)) hoi. hieu van ban duc va thanh dai ((cua tre) OR (cua triet))*.