Perhaps you should try some spelling variations:
dieu vien » dieu kien, dieu hien, dieu khien
so bang » so dang, so lang, co bang
va hanh » van hanh, va thanh, va danh
vien da » vien dai, hien dai
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
cuu tre » cua tre, cau tren, cau treo
da dac » dam dac, dai dac, va dac
dac va » duc va, day va, dat va
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: so bang ((ky lang) or (ky tang)) xa hoi. dieu vien da dac va hanh vi ((cua te) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so bang ((ky lang) OR (ky tang)) xa hoi. dieu vien da dac va hanh vi ((cua te) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: so bang ((ky lang) or (ky tang)) xa hoi. dieu vien da dac va hanh vi ((cua te) or (cuu tre))*.