Perhaps you should try some spelling variations:
thien van » thi van
van phan » van phong, van thanh, luan phan
phan duc » pham duc, phan tu, phan dau
ban hanh » ban hang
hanh dai » hanh tai, hanh dao, vanh dai
nang xa » lang xa, nang ma, mang xa
duc ban » duc tan, duc van, dua ban
cua tre » cuu tre, cua triet, dua tren
tu sai » tu bai, tu san, tu cai
sai ky » sac ky
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 sai ky ((nang xa) or (nang x)) hoi. thien van phan duc ban hanh dai ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky ((nang xa) OR (nang x)) hoi. thien van phan duc ban hanh dai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sai ky ((nang xa) or (nang x)) hoi. thien van phan duc ban hanh dai ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: tu sai ky ((nang xa) or (nang x)) hoi. thien van phan duc ban hanh dai ((cua tre) OR (cua te))*.