Perhaps you should try some spelling variations:
tuan khai » than khai, quang khai, tuong khai
vien cac » vien bach, vien dai, gian cac
khai cua » thai cua, hai cua, khi cua
te sach » toc sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
vien da » vien dai, hien dai
truc va » thuc va, thuc vat, trung va
va tuan » van tuan, va quan, va toan
cua tre » cua te, cuu tre, cua triet

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 dang xa hoi. hieu ((vien cac) OR (vien da)) truc va tuan khai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky dang xa hoi. hieu ((vien cac) OR (vien da)) truc va tuan khai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky dang xa hoi. hieu ((vien cac) OR (vien da)) truc va tuan khai cua tre*.