Perhaps you should try some spelling variations:
tham doc » than doc, tham do, tham nuoc
dinh cuu » dinh chi
hieu van » hieu va, thien van, lieu va
van tham » van thanh, van tuan, van chat
te sach » toc sach
va hanh » van hanh, va thanh, va danh
sach ky » sac ky, sach y, sach ty
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
vi cuu » vinh cuu
vi luu » vi lua
doc va » duoc va, hoc va, duc va

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 ky tang xa hoi. hieu van tham doc va hanh ((((vi cuu) OR (vi luu))) or (dinh cuu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky tang xa hoi. hieu van tham doc va hanh ((((vi cuu) OR (vi luu))) OR (dinh cuu)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky tang xa hoi. hieu van tham doc va hanh ((((vi cuu) OR (vi luu))) or (dinh cuu)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky tang xa hoi. hieu van tham doc va hanh ((((vi cuu) OR (vi luu))) or (dinh cuu)) tre*.