Perhaps you should try some spelling variations:
tuan khai » than khai, quang khai, tuong khai
hieu van » hieu va, thien van, lieu va
khai cua » thai cua, hai cua, khi cua
van tuan » van quan, van ban, anh tuan
te sach » toc sach
cam duc » cam xuc, cao duc, pham duc
le lang » le tang, le dang, le xang
ly lang » ly hang, ly vang, ly lanh
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: te sach ((ly lang) or (le lang)) xa hoi. hieu van ((cam duc) or (giao duc)) van tuan khai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ly lang) OR (le lang)) xa hoi. hieu van ((cam duc) OR (giao duc)) van tuan khai cua te.
• Adding a wildcard symbol may retrieve word variants: te sach ((ly lang) or (le lang)) xa hoi. hieu van ((cam duc) or (giao duc)) van tuan khai cua te*.