Perhaps you should try some spelling variations:
thien van » thi van
van thanh » ban thanh, van tuan
van pham » san pham, van phan, van phat
thanh di » thanh doi, thanh de, thanh do
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
duc van » duc va, duc tan, duc manh
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
y nang » ky nang, ly nang, v nang

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 y nang xa hoi. thien van pham duc van thanh di ((cuu tre) OR (cua tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang xa hoi. thien van pham duc van thanh di ((cuu tre) OR (cua tre))".
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. thien van pham duc van thanh di ((cuu tre) OR (cua tre))*.